A-LevelChemistryGroup 179701/12 · May/June 2025 · Q171 Mark
Why do the halogens become less volatile as Group 17 is descended?
AThe halogen-halogen bond energy decreases.
BThe halogen-halogen bond energy increases.
CThe number of electrons in each molecule increases.
DThe van der Waals' forces between molecules become weaker.
✓ Correct answer
C: The number of electrons in each molecule increases.
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