Question detail
Why does reactivity decrease down Group 7?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
The periodic table
Question
- A. Atoms become larger and the outer electrons are further from the nucleus
- B. Atoms become smaller and the outer electrons are closer to the nucleus
- C. The number of protons decreases
- D. The number of neutrons increases
Answer
The correct option is Atoms become larger and the outer electrons are further from the nucleus.
Explanation
The correct option is Atoms become larger and the outer electrons are further from the nucleus. Atoms become larger and the outer electrons are further from the nucleus is correct because it directly supports the approved learning objective to predict properties of Group 7 elements from trends down the group. This is tested in the subtopic Group 7 within The periodic table, so the reasoning must stay within AQA GCSE Chemistry 8462 Unit 4.1. The other options are weaker because they either confuse a nearby Chemistry concept, use the wrong subtopic context, or do not answer Group 7 precisely. Repair marker b32ffd53 keeps this question distinct from adjacent atom, ion, isotope, group, period, and electronic-structure questions.
Common mistake
Misunderstanding Reactivity Trends
Students often think that reactivity increases down Group 7 instead of decreases.
Remember that as you move down Group 7, the outer electrons are further from the nucleus, making it harder for the atom to attract electrons and thus decreasing reactivity.
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