A-LevelChemistryChemical periodicity9701/12 · May/June 2021 · Q131 Mark

L and M are elements in Period 3 of the Periodic Table. • The oxide of L is a solid at room temperature. This oxide has a giant structure. • The chloride of L does not react with water. • Argon is the only element in Period 3 with a lower melting point than M. Which formula represents a compound of elements L and M?

AAl₂S₃

BMgS

CNaCl

DPCl₅

✓ Correct answer

C: NaCl

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Topic: Chemical periodicity, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2021 Paper 1 Variant 2, question 13.

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