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Date November 2021 Marks available 1 Reference code 21N.2.hl.TZ0.2
Level HL Paper 2 Time zone TZ0
Command term Calculate Question number 2 Adapted from N/A

Question

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]
a.

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]
b.

Markscheme

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» ✔

a.

«ΔE = hν = 6.63 × 10–34 J s × 5.09 × 1014 s–1 =» 3.37 × 10–19 «J» ✔

b.

Examiners report

[N/A]
a.
[N/A]
b.

Syllabus sections

Additional higher level (AHL) » Topic 12: Atomic structure » 12.1 Electrons in atoms
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Additional higher level (AHL) » Topic 12: Atomic structure
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