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A-LevelChemistryChemical periodicity9701/12 · Oct/Nov 2024 · Q191 Mark

X and Y are elements in Period 3 of the Periodic Table. Y has a greater atomic number than X. The stable ion formed by Y has a greater radius than the stable ion formed by X. The stable ion formed by Y has 18 electrons. Which row is correct?

A10 X

B10 Y

C18 X

D18 Y

✓ Correct answer

A: 10 X

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About this question

Topic: Chemical periodicity, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2024 Paper 1 Variant 2, question 19.

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