A-LevelChemistryChemical periodicity9701/12 · Oct/Nov 2019 · Q31 Mark

The graph shows the successive ionisation energies of element X and element Y. Both elements are in Period 3. [Figure 3.1]

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AAn atom of element X needs one extra electron for a full outer shell; an atom of element Y needs three extra electrons for a full outer shell.

BAn atom of element Y has five electrons in the 3p subshell.

CElement X has an oxidation number of +7 in most of its compounds.

DWhen element X combines with element Y, the bonding is ionic.

✓ Correct answer

A: An atom of element X needs one extra electron for a full outer shell; an atom of element Y needs three extra electrons for a full outer shell.

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Topic: Chemical periodicity, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2019 Paper 1 Variant 2, question 3.

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