Question detail
Which halogen is the least reactive?
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. Fluorine
- B. Chlorine
- C. Bromine
- D. Iodine
Answer
Iodine
Explanation
Iodine is the least reactive halogen because it is located lower in Group 7, where the atomic size is larger and reactivity decreases.
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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