Explaining the trend in the reactivity of the halogens
1 mark · NormalWhich statement best explains why chlorine is more reactive than bromine?
Show answer
Correct option: Chlorine has a smaller atomic radius, so its outer electrons are more strongly attracted to the nucleus.
Common mistakes: Choosing higher nuclear charge (option 1); Choosing more energy levels (option 4)
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Marking points
B1 · 1 mark · Identifies 'Chlorine has a smaller atomic radius, so its outer electrons are more strongly attracted to the nucleus.'
Worked solution
The correct answer is: 'Chlorine has a smaller atomic radius, so its outer electrons are more strongly attracted to the nucleus.' This means chlorine can accept electrons more easily.