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In the halogen family (group 17), which member exists as a solid at room temperature?
AFluorine
BIodine
CChlorine
DBromine
Answer & Solution
Correct answer: B. Iodine
1. Group-17 elements show a gradation in physical state down the group.
2. Fluorine and chlorine are gases; bromine is a liquid.
3. Iodine, the heaviest listed, is a solid at room temperature.
4. Rule out D: bromine is a liquid, not a solid.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 2 "Periodic Classification of Elements", p.36_
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