A-LevelChemistryChemical periodicity9701/12 · Oct/Nov 2018 · Q121 Mark

The melting points of the Period 3 elements phosphorus to argon are shown in the table. Which factor explains the changes in melting points from phosphorus to argon?

Athe changes in electronegativity from phosphorus to argon

Bthe changes in first ionisation energy from phosphorus to argon

Cthe increase in the number of electrons in each atom from phosphorus to argon

Dthe number of atoms in each molecule of the element from phosphorus to argon

✓ Correct answer

D: the number of atoms in each molecule of the element from phosphorus to argon

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Topic: Chemical periodicity, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2018 Paper 1 Variant 2, question 12.

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