A-LevelChemistryChemical periodicity9701/12 · May/June 2012 · Q181 Mark

Use of the Data Booklet is relevant to this question. Sodium and sulfur react together to form sodium sulfide, Na2S. How do the atomic radius and ionic radius of sodium compare with those of sulfur?

Asodium > sulfur sodium > sulfur

Bsodium > sulfur sodium < sulfur

Csodium < sulfur sodium > sulfur

Dsodium < sulfur sodium < sulfur

✓ Correct answer

B: sodium > sulfur sodium < sulfur

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Topic: Chemical periodicity, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2012 Paper 1 Variant 2, question 18.

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