A-LevelChemistryChemical periodicity9701/12 · Oct/Nov 2023 · Q181 Mark

Which row gives the best description of the variations in the melting points and the first ionisation energies of the elements in Period 3 from sodium to argon?

Amelting points: increase up to a peak at aluminium then decrease; first ionisation energies: generally decrease

Bmelting points: increase up to a peak at aluminium then decrease; first ionisation energies: generally increase

Cmelting points: increase up to a peak at silicon then decrease; first ionisation energies: generally decrease

Dmelting points: increase up to a peak at silicon then decrease; first ionisation energies: generally increase

✓ Correct answer

D: melting points: increase up to a peak at silicon then decrease; first ionisation energies: generally increase

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Topic: Chemical periodicity, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2023 Paper 1 Variant 2, question 18.

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