A-LevelChemistryChemical periodicity9701/12 · May/June 2017 · Q121 Mark

The elements magnesium and sulfur each form doubly charged ions. How do the atomic radii and ionic radii of these elements compare?

AMg > Mg²⁺, S > S²⁻

BMg > Mg²⁺, S < S²⁻

CMg < Mg²⁺, S > S²⁻

DMg < Mg²⁺, S < S²⁻

✓ Correct answer

B: Mg > Mg²⁺, S < S²⁻

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Topic: Chemical periodicity, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2017 Paper 1 Variant 2, question 12.

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