A-LevelChemistryChemical periodicity9701/12 · Oct/Nov 2013 · Q191 Mark

Consecutive elements X, Y and Z are in the third period of the Periodic Table. Element Y has the highest first ionisation energy and the lowest melting point of these three elements. What could be the identities of X, Y and Z?

Asodium, magnesium, aluminium

Bmagnesium, aluminium, silicon

Caluminium, silicon, phosphorus

Dsilicon, phosphorus, sulfur

✓ Correct answer

D: silicon, phosphorus, sulfur

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Topic: Chemical periodicity, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2013 Paper 1 Variant 2, question 19.

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