O-LevelChemistryBonding & Structure5070/11 · Oct/Nov 2018 · Q251 Mark

The melting point of lithium is 181 °C. The melting point of sodium is 98 °C. Which statement explains why lithium has a higher melting point than sodium?

ALithium has more valency electrons than sodium.

BSodium is more reactive than lithium.

CSodium is softer than lithium.

DThe attraction between the positive ions and the 'sea of electrons' is stronger in lithium than in sodium.

✓ Correct answer

D: The attraction between the positive ions and the 'sea of electrons' is stronger in lithium than in sodium.

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Topic: Bonding & Structure, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2018 Paper 1 Variant 1, question 25.

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