A-LevelChemistryChemical periodicity9701/12 · Oct/Nov 2022 · Q181 Mark

The melting points of the Period 3 elements sodium to aluminium are shown in the table. [Table 18.1: element, melting point/K] Which factor explains the increase in melting points from sodium to aluminium?

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Athe change in first ionisation energy from sodium to aluminium

Bthe increase in electronegativity from sodium to aluminium

Cthe increase in the Ar of the elements from sodium to aluminium

Dthe increase in the number of outer electrons in each atom from sodium to aluminium

✓ Correct answer

D: the increase in the number of outer electrons in each atom from sodium to aluminium

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Topic: Chemical periodicity, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2022 Paper 1 Variant 2, question 18.

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