A-LevelChemistryChemical periodicity9701/12 · Oct/Nov 2018 · Q31 Mark

Rubidium and bromine form ions that are isoelectronic. Each ion has 36 electrons. Which row is correct?

Arubidium radii: atomic < ionic, bromine /bromide radii: atomic < ionic

Brubidium radii: atomic < ionic, bromine /bromide radii: atomic > ionic

Crubidium radii: atomic > ionic, bromine /bromide radii: atomic < ionic

Drubidium radii: atomic > ionic, bromine /bromide radii: atomic > ionic

✓ Correct answer

C: rubidium radii: atomic > ionic, bromine /bromide radii: atomic < ionic

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Topic: Chemical periodicity, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2018 Paper 1 Variant 2, question 3.

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