A-LevelChemistryAtomic structureMay/June 2022Paper 1 Q181 Mark

Why is the ionic radius of a sulfide ion larger than the ionic radius of a potassium ion?

Q: What topic does this question test?

This question tests Atomic structure in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

AIonic radius always decreases with increasing atomic number.

BPositive ions always have smaller radii than negative ions.

CThe potassium ion has more protons in its nucleus than the sulfide ion.

DThe sulfide ion is doubly charged; the potassium ion is singly charged.

✓ Correct Answer

The correct answer is C: The potassium ion has more protons in its nucleus than the sulfide ion.

📋 Examiner Report & Trap Analysis

Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...

🎯 Mark Scheme Breakdown

Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.

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About This A-Level Chemistry Question

Topic

This multiple-choice question tests Atomic structure in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Chemistry May/June 2022 examination, Paper 1 Variant 2.

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