Question detail
Which factor primarily contributes to the decrease in reactivity of halogens 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. Increase in atomic size
- B. Decrease in atomic mass
- C. Increase in ionization energy
- D. Decrease in electronegativity
Answer
Increase in atomic size
Explanation
The increase in atomic size down Group 7 means that the outer electrons are further from the nucleus, making it more difficult to attract additional electrons.
Common mistake
Reactivity Misunderstanding
Students often think that reactivity increases down Group 7 instead of decreases.
Focus on the concept that as you move down Group 7, the outer electrons are further from the nucleus, making it harder for the atom to attract additional electrons, thus decreasing reactivity.
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