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DP IB Chemistry: HL

Revision Notes

Home / IB / Chemistry: HL / DP / Revision Notes / 12. HL Atomic Structure / 12.1 Electrons in Atoms / 12.1.2 Ionisation Energy Trends


12.1.2 Ionisation Energy Trends


Trends Across a Period

  • Ionisation energies show periodicity – a trend across a period of the Periodic Table
  • As could be expected from their electron configuration, the group 1 metals have a relatively low ionisation energy, whereas the noble gases have very high ionisation energies
  • The size of the first ionisation energy is affected by four factors:
    • Size of the nuclear charge
    • Distance of outer electrons from the nucleus
    • Shielding effect of inner electrons
    • Spin-pair repulsion
  • First ionisation energy increases across a period and decreases down a group

Atomic Structure Ionisation Energy across Periods, downloadable AS & A Level Chemistry revision notes

A graph showing the ionisation energies of the elements hydrogen to sodium

Ionisation energy across a period

  • The ionisation energy across a period generally increases due to the following factors:
    • Across a period the nuclear charge increases
    • This causes the atomic radius of the atoms to decrease, as the outer shell is pulled closer to the nucleus, so the distance between the nucleus and the outer electrons decreases
    • The shielding by inner shell electrons remain reasonably constant as electrons are being added to the same shell
    • It becomes harder to remove an electron as you move across a period; more energy is needed
    • So, the ionisation energy increases

Dips in the trend

  • There is a slight decrease in IE1 between beryllium and boron as the fifth electron in boron is in the 2p subshell, which is further away from the nucleus than the 2s subshell of beryllium
    • Beryllium has a first ionisation energy of 900 kJ mol-1 as its electron configuration is 1s2 2s2
    • Boron has a first ionisation energy of 800 kJ mol-1 as its electron configuration is 1s2 2s2 2px1

  • There is a slight decrease in IE1 between nitrogen and oxygen due to spin-pair repulsion in the 2px orbital of oxygen
    • Nitrogen has a first ionisation energy of 1400 kJ mol-1 as its electron configuration is 1s2 2s2 2px1 2py1 2pz1
    • Oxygen has a first ionisation energy of 1310 kJ mol-1 as its electron configuration is 1s2 2s2 2px2 2py1 2pz1
    • In oxygen, there are 2 electrons in the 2px orbital, so the repulsion between those electrons makes it slightly easier for one of those electrons to be removed

From one period to the next

  • There is a large decrease in ionisation energy between the last element in one period, and the first element in the next period
  • This is because:
    • There is increased distance between the nucleus and the outer electrons as you have added a new shell
    • There is increased shielding by inner electrons because of the added shell
    • These two factors outweigh the increased nuclear charge

Successive Ionisation Energies

Successive ionisation energies of an element

  • The successive ionisation energies of an element increase
  • This is because once you have removed the outer electron from an atom, you have formed a positive ion
  • Removing an electron from a positive ion is more difficult than from a neutral atom
  • As more electrons are removed, the attractive forces increase due to decreasing shielding and an increase in the proton to electron ratio
  • The increase in ionisation energy, however, is not constant and is dependent on the atom’s electronic configuration
  • Taking calcium as an example:

Ionisation Energies of Calcium Table

Ionization Energies_ Trends first four ionization energies of calcium table, downloadable IB Chemistry revision notes

Successive Ionisation Energies of Calcium, downloadable IB Chemistry revision notes

Successive ionisation energies for the element calcium

  • The first electron removed has a low IE1 as it is easily removed from the atom due to the spin-pair repulsion of the electrons in the 4s orbital
  • The second electron is more difficult to remove than the first electron as there is no spin-pair repulsion
  • The third electron is much more difficult to remove than the second one corresponding to the fact that the third electron is in a principal quantum shell which is closer to the nucleus (3p)
  • Removal of the fourth electron is more difficult as the orbital is no longer full, and there is less spin-pair repulsion
  • The graph shows there is a large increase in successive ionisation energy as the electrons are being removed from an increasingly positive ion
  • The big jumps on the graph show the change of shell and the small jumps are the change of subshell

Deducing the Group

  • Successive ionisation data can be used to:
    • Predict or confirm the simple electronic configuration of elements
    • Confirm the number of electrons in the outer shell of an element
    • Deduce the group an element belongs to in the Periodic Table
  • By analysing where the large jumps appear and the number of electrons removed when these large jumps occur, the electron configuration of an atom can be determined
  • Na, Mg and Al will be used as examples to deduce the electronic configuration and positions of elements in the Periodic Table using their successive ionisation energies

Successive Ionisation Energies Table

Ionisation Energies of Na, Mg and Al, downloadable IB Chemistry revision notes

Sodium

  • For sodium, there is a huge jump from the first to the second ionisation energy, indicating that it is much easier to remove the first electron than the second
  • Therefore, the first electron to be removed must be the last electron in the valence shell thus Na belongs to group I
  • The large jump corresponds to moving from the 3s to the full 2p subshellNa       1s2 2s2 2p6 3s1

Magnesium

  • There is a huge increase from the second to the third ionisation energy, indicating that it is far easier to remove the first two electrons than the third
  • Therefore the valence shell must contain only two electrons indicating that magnesium belongs to group II
  • The large jump corresponds to moving from the 3s to the full 2p subshell

    Mg       1s2 2s2 2p6 3s2

Aluminium

  • There is a huge increase from the third to the fourth ionisation energy, indicating that it is far easier to remove the first three electrons than the fourth
  • The 3p electron and 3s electrons are relatively easy to remove compared with the 2p electrons which are located closer to the nucleus and experience greater nuclear charge 
  • The large jump corresponds to moving from the third shell to the second shellAl         1s2 2s2 2p6 3s2 3p1

Worked Example

Values for the successive IEs of an unknown element are:IE1 = 899 kJ mol-1, IE2 = 1757 kJ mol-1, IE3 = 14850 kJ mol-1, IE4 = 21005 kJ mol-1Deduce which group of the periodic table of elements you would expect to find the unknown element.

Answer:

The largest jump is between IE2 and IE3 which will correspond to a change in energy level. Therefore the unknown element must be in group 2.

Worked Example

The table shows successive ionisation energies for element X in period 2.

Successive Ionisation Energies of Oxygen, downloadable IB Chemistry revision notes

Identify element X.

Answer:

    • The largest jump in ionisation energy is between IE6 and IE7 meaning that the 7th electron is being removed from an energy level closer to the nucleus
    • Therefore element X must be group 6
    • If element X is in group 6 and in period 2 it must be oxygen

 



  • 1. Stoichiometric Relationships
    • 1.1 Matter, Chemical Change & the Mole Concept
      • 1.1.1 Elements, Compounds & Mixtures
        • 1.1.2 Equations
          • 1.1.3 State Changes
            • 1.1.4 The Mole Concept
              • 1.1.5 Moles-Mass Problems
                • 1.1.6 Empirical Formulae
                • 1.2 Reacting Masses & Volumes
                  • 1.2.1 Reacting Masses
                    • 1.2.2 Reaction Yields
                      • 1.2.3 Avogadro's Law & Molar Gas Volume
                        • 1.2.4 The Ideal Gas Equation
                          • 1.2.5 Gas Law Relationships
                            • 1.2.6 Real Gases
                              • 1.2.7 Standard Solutions
                                • 1.2.8 Concentration Calculations
                                  • 1.2.9 Titrations
                                • 2. Atomic Structure
                                  • 2.1 Atomic & Electronic Structure
                                    • 2.1.1 The Nuclear Atom
                                      • 2.1.2 Deducing Subatomic Particles
                                        • 2.1.3 Relative Atomic Mass Calculations
                                          • 2.1.4 The Electromagnetic Spectrum
                                            • 2.1.5 Emission Spectra
                                              • 2.1.6 Energy Levels & Sublevels
                                                • 2.1.7 Sublevels & Orbitals
                                                  • 2.1.8 Writing Electron Configurations
                                                • 3. Periodicity
                                                  • 3.1 The Periodic Table & Periodic Trends
                                                    • 3.1.1 The Periodic Table
                                                      • 3.1.2 Periodic Trends: Physical - Atomic & Ionic Radius
                                                        • 3.1.3 Periodic Trends: Physical - Ionisation Energy
                                                          • 3.1.4 Periodic Trends: Physical - Electron Affinity
                                                            • 3.1.5 Periodic Trends: Physical - Electronegativity
                                                              • 3.1.6 Periodic Trends: Chemical
                                                              • 3.2 Oxides, Group 1 & Group 17
                                                                • 3.2.1 Periodic Trends: Oxides Across a Period
                                                                  • 3.2.2 Periodic Trends: Group 1 - The Alkali Metals
                                                                    • 3.2.3 Periodic Trends: Group 17 - The Halogens
                                                                  • 4. Chemical Bonding & Structure
                                                                    • 4.1 Ionic & Covalent Bonding
                                                                      • 4.1.1 Forming Ions
                                                                        • 4.1.2 Ionic Compounds
                                                                          • 4.1.3 Formulae & Names of Ionic Compounds
                                                                            • 4.1.4 Covalent Bonds
                                                                              • 4.1.5 Bond Polarity
                                                                                • 4.1.6 Lewis Structures
                                                                                • 4.2 Resonance, Shapes & Giant Structures
                                                                                  • 4.2.1 Resonance Structures
                                                                                    • 4.2.2 Shapes of Molecules
                                                                                      • 4.2.3 Predicting Molecular Shapes
                                                                                        • 4.2.4 Molecular Polarity
                                                                                          • 4.2.5 Giant Covalent Structures
                                                                                          • 4.3 Intermolecular Forces & Metallic Bonding
                                                                                            • 4.3.1 Types of Intermolecular Forces
                                                                                              • 4.3.2 Deducing Intermolecular Forces
                                                                                                • 4.3.3 Properties of Covalent Compounds
                                                                                                  • 4.3.4 Metallic Bonding
                                                                                                    • 4.3.5 Trends in Melting Points of Metals
                                                                                                      • 4.3.6 Alloys & their Properties
                                                                                                    • 5. Energetics/ Thermochemistry
                                                                                                      • 5.1 Energetics
                                                                                                        • 5.1.1 Energy Changes in Reactions
                                                                                                          • 5.1.2 Standard Enthalpy Change
                                                                                                            • 5.1.3 Calorimetry
                                                                                                              • 5.1.4 Calorimetry Experiments
                                                                                                              • 5.2 Hess's Law
                                                                                                                • 5.2.1 Hess's Law
                                                                                                                  • 5.2.2 Using Hess's Law - Cycles
                                                                                                                    • 5.2.3 Using Hess's Law - Equations
                                                                                                                      • 5.2.4 Using ∆Hf° to Find Enthalpy Changes
                                                                                                                      • 5.3 Bond Enthalpy
                                                                                                                        • 5.3.1 Bond Enthalpy
                                                                                                                          • 5.3.2 Bond Enthalpy Calculations
                                                                                                                            • 5.3.3 Energy Profiles
                                                                                                                              • 5.3.4 Case Study: Ozone
                                                                                                                            • 6. Chemical Kinetics
                                                                                                                              • 6.1 Chemical Kinetics
                                                                                                                                • 6.1.1 Collision Theory
                                                                                                                                  • 6.1.2 Rate of Reaction
                                                                                                                                    • 6.1.3 Measuring Rates
                                                                                                                                      • 6.1.4 Activation Energy
                                                                                                                                        • 6.1.5 Rate Experiments
                                                                                                                                          • 6.1.6 Explaining Rates
                                                                                                                                            • 6.1.7 Maxwell-Boltzmann Curves
                                                                                                                                              • 6.1.8 Energy Profiles & Catalysis
                                                                                                                                            • 7. Equilibrium
                                                                                                                                              • 7.1 Equilibrium
                                                                                                                                                • 7.1.1 The State of Equilibrium
                                                                                                                                                  • 7.1.2 The Equilibrium Law
                                                                                                                                                    • 7.1.3 Equilibrium Constant Relationships
                                                                                                                                                      • 7.1.4 The Reaction Quotient
                                                                                                                                                        • 7.1.5 Le Chatelier's Principle
                                                                                                                                                          • 7.1.6 Catalysts & Equilibrium
                                                                                                                                                        • 8. Acids & Bases
                                                                                                                                                          • 8.1 Theories & Reactions of Acids & Bases
                                                                                                                                                            • 8.1.1 Brønsted–Lowry Acids & Bases
                                                                                                                                                              • 8.1.2 Conjugate Acid-Base Pairs
                                                                                                                                                                • 8.1.3 Characteristic Reactions of Acids
                                                                                                                                                                  • 8.1.4 Neutralization
                                                                                                                                                                  • 8.2 More About Acids
                                                                                                                                                                    • 8.2.1 Acid-base Titrations
                                                                                                                                                                      • 8.2.2 pH & [H⁺]
                                                                                                                                                                        • 8.2.3 Interpreting pH
                                                                                                                                                                          • 8.2.4 The Ionic Product of Water
                                                                                                                                                                            • 8.2.5 Acid-Base Calculations
                                                                                                                                                                              • 8.2.6 pH Meters & Universal Indicator
                                                                                                                                                                                • 8.2.7 Strong & Weak Acids & Bases
                                                                                                                                                                                  • 8.2.8 Comparing Strong & Weak Acids
                                                                                                                                                                                  • 8.3 Acid Deposition
                                                                                                                                                                                    • 8.3.1 Acid Deposition
                                                                                                                                                                                      • 8.3.2 Effects of Acid Deposition
                                                                                                                                                                                        • 8.3.3 Reducing Sulfur Oxide Emissions
                                                                                                                                                                                      • 9. Redox Processes
                                                                                                                                                                                        • 9.1 Redox Processes
                                                                                                                                                                                          • 9.1.1 Oxidation & reduction
                                                                                                                                                                                            • 9.1.2 Deducing Oxidation Numbers
                                                                                                                                                                                              • 9.1.3 Oxidizing & Reducing agents
                                                                                                                                                                                                • 9.1.4 Naming Transition Metal Compounds
                                                                                                                                                                                                  • 9.1.5 Half Equations
                                                                                                                                                                                                    • 9.1.6 The Activity Series
                                                                                                                                                                                                      • 9.1.7 Redox Titrations
                                                                                                                                                                                                        • 9.1.8 The Winkler Method
                                                                                                                                                                                                          • 9.1.9 Voltaic Cells
                                                                                                                                                                                                            • 9.1.10 Electrolytic Cells
                                                                                                                                                                                                          • 10. Organic Chemistry
                                                                                                                                                                                                            • 10.1 Fundamentals of Organic Chemistry
                                                                                                                                                                                                              • 10.1.1 Homologous Series
                                                                                                                                                                                                                • 10.1.2 Understanding Organic Molecules
                                                                                                                                                                                                                  • 10.1.3 Nomenclature
                                                                                                                                                                                                                    • 10.1.4 Organic Families - Hydrocarbons
                                                                                                                                                                                                                      • 10.1.5 Organic Families - Halogenoalkanes
                                                                                                                                                                                                                        • 10.1.6 Organic Families - Alcohols & Ethers
                                                                                                                                                                                                                          • 10.1.7 Organic Families - Carbonyls
                                                                                                                                                                                                                            • 10.1.8 Organic Families - Carboxylic Acids & Esters
                                                                                                                                                                                                                              • 10.1.9 Organic Families - Organic Nitrogen Compounds
                                                                                                                                                                                                                                • 10.1.10 3-D modelling
                                                                                                                                                                                                                                  • 10.1.11 Primary, Secondary & Tertiary atoms
                                                                                                                                                                                                                                    • 10.1.12 Benzene
                                                                                                                                                                                                                                    • 10.2 Functional Group Chemistry
                                                                                                                                                                                                                                      • 10.2.1 Alkanes - Combustion
                                                                                                                                                                                                                                        • 10.2.2 Alkanes - Halogenation
                                                                                                                                                                                                                                          • 10.2.3 Alkenes - Reactivity
                                                                                                                                                                                                                                            • 10.2.4 Alkenes - Hydrogenation
                                                                                                                                                                                                                                              • 10.2.5 Alkenes - Halogenation
                                                                                                                                                                                                                                                • 10.2.6 Alkenes - Hydrohalogenation
                                                                                                                                                                                                                                                  • 10.2.7 Alkenes - Hydration
                                                                                                                                                                                                                                                    • 10.2.8 Addition Polymers
                                                                                                                                                                                                                                                      • 10.2.9 Alcohols - Combustion
                                                                                                                                                                                                                                                        • 10.2.10 Alcohols - Oxidation
                                                                                                                                                                                                                                                          • 10.2.11 Alcohols - Esterification
                                                                                                                                                                                                                                                            • 10.2.12 Halogenoalkanes
                                                                                                                                                                                                                                                              • 10.2.13 Reactions of Benzene
                                                                                                                                                                                                                                                            • 11. Measurements & Data Processes
                                                                                                                                                                                                                                                              • 11.1 Spectroscopic Identification
                                                                                                                                                                                                                                                                • 11.1.1 Index of Hydrogen Deficiency
                                                                                                                                                                                                                                                                  • 11.1.2 Mass Spectrometry
                                                                                                                                                                                                                                                                    • 11.1.3 Nuclear Magnetic Resonance Spectroscopy
                                                                                                                                                                                                                                                                      • 11.1.4 Infrared Spectroscopy
                                                                                                                                                                                                                                                                      • 11.2 Synoptic Data Handling & Graphical Skills
                                                                                                                                                                                                                                                                        • 11.2.1 Recording Data
                                                                                                                                                                                                                                                                          • 11.2.2 Processing Errors
                                                                                                                                                                                                                                                                            • 11.2.3 Reducing the Impact of Errors
                                                                                                                                                                                                                                                                              • 11.2.4 Percentage Error
                                                                                                                                                                                                                                                                                • 11.2.5 Drawing Graphs
                                                                                                                                                                                                                                                                                  • 11.2.6 Analysing Graphs
                                                                                                                                                                                                                                                                                • 12. HL Atomic Structure
                                                                                                                                                                                                                                                                                  • 12.1 Electrons in Atoms
                                                                                                                                                                                                                                                                                    • 12.1.1 Emission Spectra & First Ionisation Energy
                                                                                                                                                                                                                                                                                      • 12.1.2 Ionisation Energy Trends
                                                                                                                                                                                                                                                                                    • 13. HL The Periodic Table- Transition Metals
                                                                                                                                                                                                                                                                                      • 13.1 Transition Metals
                                                                                                                                                                                                                                                                                        • 13.1.1 Transition Elements
                                                                                                                                                                                                                                                                                          • 13.1.2 Variable Oxidation States
                                                                                                                                                                                                                                                                                            • 13.1.3 Complex Ions
                                                                                                                                                                                                                                                                                              • 13.1.4 Catalytic & Magnetic Properties
                                                                                                                                                                                                                                                                                                • 13.1.5 Colour in Transition Metals
                                                                                                                                                                                                                                                                                                  • 13.1.6 Factors Affecting Colour
                                                                                                                                                                                                                                                                                                • 14. HL Chemical Bonding & Structure
                                                                                                                                                                                                                                                                                                  • 14.1 More Structures & Shapes
                                                                                                                                                                                                                                                                                                    • 14.1.1 Covalent Bonds
                                                                                                                                                                                                                                                                                                      • 14.1.2 More Lewis Structures
                                                                                                                                                                                                                                                                                                        • 14.1.3 Further VSEPR Theory
                                                                                                                                                                                                                                                                                                          • 14.1.4 Formal Charge
                                                                                                                                                                                                                                                                                                          • 14.2 Further Aspects of Bonding
                                                                                                                                                                                                                                                                                                            • 14.2.1 Delocalisation & Resonance
                                                                                                                                                                                                                                                                                                              • 14.2.2 Ozone Revisited
                                                                                                                                                                                                                                                                                                                • 14.2.3 Hybrid Orbitals
                                                                                                                                                                                                                                                                                                              • 15. HL Energetics / Thermochemistry
                                                                                                                                                                                                                                                                                                                • 15.1 Energy Cycles
                                                                                                                                                                                                                                                                                                                  • 15.1.1 Key Enthalpy Terms
                                                                                                                                                                                                                                                                                                                    • 15.1.2 Born-Haber Cycles
                                                                                                                                                                                                                                                                                                                      • 15.1.3 Born-Haber Cycle Calculations
                                                                                                                                                                                                                                                                                                                        • 15.1.4 Dissolution Energy Cycles
                                                                                                                                                                                                                                                                                                                          • 15.1.5 Energy Changes in Aqueous Solutions
                                                                                                                                                                                                                                                                                                                          • 15.2 Entropy & Spontaneity
                                                                                                                                                                                                                                                                                                                            • 15.2.1 Entropy
                                                                                                                                                                                                                                                                                                                              • 15.2.2 Calculating Entropy Change
                                                                                                                                                                                                                                                                                                                                • 15.2.3 Gibbs Free Energy
                                                                                                                                                                                                                                                                                                                                  • 15.2.4 Spontaneous Reactions
                                                                                                                                                                                                                                                                                                                                    • 15.2.5 Free Energy & Equilibrium
                                                                                                                                                                                                                                                                                                                                  • 16. HL Chemical Kinetics
                                                                                                                                                                                                                                                                                                                                    • 16.1 Rate Expression & Reaction Mechanism
                                                                                                                                                                                                                                                                                                                                      • 16.1.1 Rate Equations
                                                                                                                                                                                                                                                                                                                                        • 16.1.2 Rate Constants
                                                                                                                                                                                                                                                                                                                                          • 16.1.3 Graphical Representations
                                                                                                                                                                                                                                                                                                                                            • 16.1.4 Rate Determining Step
                                                                                                                                                                                                                                                                                                                                              • 16.1.5 Mechanism Problems
                                                                                                                                                                                                                                                                                                                                              • 16.2 Activation Energy
                                                                                                                                                                                                                                                                                                                                                • 16.2.1 The Arrhenius Equation
                                                                                                                                                                                                                                                                                                                                                  • 16.2.2 Graphing the Arrhenius Equation
                                                                                                                                                                                                                                                                                                                                                    • 16.2.3 Activation Energy from Rate Constants
                                                                                                                                                                                                                                                                                                                                                  • 17. HL Equilibrium
                                                                                                                                                                                                                                                                                                                                                    • 17.1 The Equilibrium Law
                                                                                                                                                                                                                                                                                                                                                      • 17.1.1 Applying the Equilibrium Law
                                                                                                                                                                                                                                                                                                                                                        • 17.1.2 Gibbs Free Energy & the Equilibrium Constant
                                                                                                                                                                                                                                                                                                                                                      • 18. HL Acids & Bases
                                                                                                                                                                                                                                                                                                                                                        • 18.1 Further Aspects of Acids & Bases
                                                                                                                                                                                                                                                                                                                                                          • 18.1.1 Lewis Theory
                                                                                                                                                                                                                                                                                                                                                            • 18.1.2 pH Curves
                                                                                                                                                                                                                                                                                                                                                              • 18.1.3 Indicators
                                                                                                                                                                                                                                                                                                                                                                • 18.1.4 Buffers
                                                                                                                                                                                                                                                                                                                                                                  • 18.1.5 Salt Hydrolysis
                                                                                                                                                                                                                                                                                                                                                                  • 18.2 Calculations Involving Acids & Bases
                                                                                                                                                                                                                                                                                                                                                                    • 18.2.1 Acid & Base Dissociation Constants
                                                                                                                                                                                                                                                                                                                                                                      • 18.2.2 Acid & Base Problem Solving
                                                                                                                                                                                                                                                                                                                                                                    • 19. HL Redox Processes
                                                                                                                                                                                                                                                                                                                                                                      • 19.1 Electrochemical Cells
                                                                                                                                                                                                                                                                                                                                                                        • 19.1.1 Electrochemical Cells
                                                                                                                                                                                                                                                                                                                                                                          • 19.1.2 The Standard Hydrogen Electrode
                                                                                                                                                                                                                                                                                                                                                                            • 19.1.3 Electrolysis of Aqueous Solutions
                                                                                                                                                                                                                                                                                                                                                                              • 19.1.4 Quantitative Electrolysis
                                                                                                                                                                                                                                                                                                                                                                                • 19.1.5 Free Energy & Eº
                                                                                                                                                                                                                                                                                                                                                                                  • 19.1.6 Electroplating
                                                                                                                                                                                                                                                                                                                                                                                • 20. HL Organic Chemistry
                                                                                                                                                                                                                                                                                                                                                                                  • 20.1 Types of Organic Reactions
                                                                                                                                                                                                                                                                                                                                                                                    • 20.1.1 Nucleophilic Substitution Reactions
                                                                                                                                                                                                                                                                                                                                                                                      • 20.1.2 Electrophilic Addition Reactions
                                                                                                                                                                                                                                                                                                                                                                                        • 20.1.3 Electrophilic Substitution Reactions
                                                                                                                                                                                                                                                                                                                                                                                          • 20.1.4 Reduction Reactions
                                                                                                                                                                                                                                                                                                                                                                                          • 20.2 Synthetic Routes
                                                                                                                                                                                                                                                                                                                                                                                            • 20.2.1 Synthesis
                                                                                                                                                                                                                                                                                                                                                                                            • 20.3 Stereoisomerism
                                                                                                                                                                                                                                                                                                                                                                                              • 20.3.1 Stereoisomers
                                                                                                                                                                                                                                                                                                                                                                                                • 20.3.2 Cis-Trans & E/Z Isomers
                                                                                                                                                                                                                                                                                                                                                                                                  • 20.3.3 Optical Isomers
                                                                                                                                                                                                                                                                                                                                                                                                • 21. Measurement & Analysis
                                                                                                                                                                                                                                                                                                                                                                                                  • 21.1 Spectroscopic Identification of Organic compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • 21.1.1 High Resolution NMR
                                                                                                                                                                                                                                                                                                                                                                                                      • 21.1.2 X-Ray Crystallography
                                                                                                                                                                                                                                                                                                                                                                                                        • 21.1.3 Structure Identification Problems
                                                                                                                                                                                                                                                                                                                                                                                                      Stewart Hird

                                                                                                                                                                                                                                                                                                                                                                                                      Author: Stewart

                                                                                                                                                                                                                                                                                                                                                                                                      Stewart has been an enthusiastic GCSE, A Level and IB Chemistry teacher for more than 30 years in the UK as well as overseas, and has been an examiner for IB and A Level, also. As a long-standing Head of Department, Stewart brings a wealth of experience to creating Topic Questions and revision materials for Save My Exams.


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