A-LevelChemistryChemical periodicity9701/12 · May/June 2019 · Q141 Mark

Elements D and E are both in Period 3. Element D has the smallest atomic radius in Period 3. There are only two elements in Period 3 which have a lower melting point than element E. Elements D and E react together to form compound L. Which compound could be L?

AMgCl2

BMgS

CNa2S

DPC13

✓ Correct answer

D: PC13

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Topic: Chemical periodicity, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2019 Paper 1 Variant 2, question 14.

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