A-LevelChemistryGroup 179701/12 · May/June 2013 · Q191 Mark
The halogens exist as diatomic molecules, X₂. The boiling points of the Group VII elements increase as the group is descended from chlorine to iodine. Which statement helps to explain this increase in boiling point as Group VII is descended?
AThe electronegativity of X decreases as the group is descended.
BThe number of electrons in each X₂ molecule increases as the group is descended.
CThe size of the permanent dipole in the X₂ molecule increases as the group is descended.
DThe X–X bond strength increases as the group is descended.
✓ Correct answer
B: The number of electrons in each X₂ molecule increases as the group is descended.
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