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?
✓ Correct Answer
The correct answer is B: The number of electrons in each X₂ molecule increases as the group is descended.
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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