Question 21N.2.HL.TZ0.2
| Date | November 2021 | Marks available | [Maximum mark: 3] | Reference code | 21N.2.HL.TZ0.2 |
| Level | HL | Paper | 2 | Time zone | TZ0 |
| Command term | Calculate, Explain | Question number | 2 | Adapted from | N/A |
Electron transitions are related to trends in the periodic table.
Explain the general increase in trend in the first ionization energies of the period 3 elements, Na to Ar.
[2]
increasing number of protons
OR
increasing nuclear charge ✔
«atomic» radius/size decreases
OR
same number of shells/electrons occupy same shell
OR
similar shielding «by inner electrons» ✔
Sodium emits yellow light with a frequency of 5.09 × 1014 Hz when electrons transition from 3p to 3s orbitals.
Calculate the energy difference, in J, between these two orbitals using sections 1 and 2 of the data booklet.
Darling, D, n.d. D lines (of sodium). [online] Available at <https://www.daviddarling.info/encyclopedia/D/D_lines.html> [Accessed 6 May 2020].
[1]
«ΔE = hν = 6.63 × 10–34 J s × 5.09 × 1014 s–1 =» 3.37 × 10–19 «J» ✔
