A-LevelChemistryChemical periodicity9701/12 · May/June 2010 · Q181 Mark

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

Aaluminium, silicon, phosphorus

Bmagnesium, aluminium, silicon

Csilicon, phosphorus, sulfur

Dsodium, magnesium, aluminium

✓ Correct answer

C: silicon, phosphorus, sulfur

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Topic: Chemical periodicity, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2010 Paper 1 Variant 2, question 18.

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