Periodicity

For each question choose the answer you consider to be the best.

1. An element is in period 3 and group 15 of the periodic table. How many electrons are present in the highest occupied energy level of this element?

A. 3

B. 5

C. 13

D. 15

2. Which species has the same configuration of electrons as a Mg²⁺ ion?

A. Na atom

B. F⁺ ion

C. Ne atom

D. O^– ion

3. Which element is a transition metal?

A. lead, Pb

B. gallium, Ga

C. strontium, Sr

D. iron, Fe

4. Which is the correct electron configuration for an atom with the atomic number 34 ?

A. Is²2s²2p⁶3s²3p⁶3d¹⁰

B. Is²2s²2p⁶3s²3p⁶3d¹⁰4p⁶

C. [Ar]4s²3d¹⁰4p⁴

D. [Ar]3d¹⁰4p⁶

5. Which best describes the trends of electronegativity values within the periodic table?

A. The values increase across a period (from left to right) and decrease down a group.

B. The values increase across a period (from left to right) and increase down a group.

C. The values decrease across a period (from left to right) and decrease down a group.

D. The values decrease across a period (from left to right) and increase down a group.

6. Which properties increase in value when descending group 1?

I. First ionization energy

II. Atomic radius

III. Reactivity with water

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

7. The first ionization energies for three consecutive elements in the periodic table are
1251, 1521 and 419 kJ mol^-1 respectively. Which elements have these values?

A. carbon, nitrogen, oxygen

B. neon, sodium, magnesium

C. sodium, magnesium, aluminium

D. chlorine, argon, potassium

8. Which is correct when the ionic or atomic radii are compared?

A. Ca²⁺ < Ca⁺

B. Cl^- < Cl

C. Na < Na⁺

D. B < C

9. Which factors lead to an element having a high first ionization energy?

I. Completely filled outer energy level

II. Small atomic radius

III. High number of completely filled inner energy levels

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

10. Which statement about a trend within the periodic table is correct?

A. Melting points decrease in group 1 from lithium to caesium.

B. Atomic radii increase in period 3 from sodium to chlorine.

C. Electronegativities increase in group 17 from fluorine to iodine.

D. First ionization energies increase in group 14 from carbon to lead.

11. Which equation represents the first ionization energy of carbon?

A. C(s) → C⁺(g) + e^–

B. C(g) + e^– → C^–(g)

C. C(s) + e^– → C^–(g)

D. C(g) → C⁺(g) + e^–

12. Why do the boiling points of the halogens increase down the group?

A. The molecules become more polar due to increasing electronegativities.

B. The strength of the temporary dipoles increases.

C. The bond enthalpies increase.

D. The ionization energies increase.

13. Which is a correct statement about the halogens or their ions?

A. Halide ions are all oxidising agents with the fluoride ion being the strongest

B. Bromine can oxidise iodide ions.

C. Iodine can oxidise chloride ions.

D. Fluorine is a stronger reducing agent than iodine.

14. Which react with water to form acidic solutions?

I. Sodium oxide, Na₂O

II. Phosphorus pentoxide, P₄O₁₀

III. Sulfur trioxide, SO₃

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

15. Which reaction produces a coloured substance?

A. The addition of sodium metal to water.

B. The addition of sulfur dioxide gas to water.

C. Burning sodium metal in chlorine gas.

D. The addition of chlorine gas to a solution of potassium iodide.

16. Which of the following reacts with water to give a solution with a pH > 7?

A. Silicon dioxide

B. Sodium chloride

C. Sulfur trioxide

D. Magnesium oxide

17. Which is a correct statement about all the elements in period 3?

A. They all contain the same number of electrons in their outer energy level

B. Their boiling points increase (going from left to right).

C. They have the same number of partially or fully occupied main energy levels.

D. Their atomic radii increase (going from left to right).

18. Which sub-level is being occupied by the outer electrons of the actinoids ?

A. 4f

B. 5f

C 6f

D. 7f

19. Which support the statement that aluminium oxide is amphoteric?

I. Al₂O₃ can react with strong acids and bases.

II. Al₂O₃ dissolves in water to give a neutral solution.

III. Al₂O₃ can react to form a salt with sodium hydroxide and with hydrochloric acid.

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

20. Which statement is true about the values for the electronegativity of the two elements?

A. Li > K

B. Li > B

C. Br > F

D. N > O

Answers

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