alleryWhich one of these does NOT belong to the halogen family?
AFluorine
BChlorine
CIodine
DArgon
Answer & Solution
Correct answer: D. Argon
1. Halogens occupy Group 17 of the periodic table.
2. They have seven valence electrons each.
3. Fluorine, chlorine and iodine all have seven valence electrons.
4. Argon has a complete outer shell with eight valence electrons.
5. So argon is a noble gas, not a halogen.
6. Hence argon does not belong to the halogen family.
_Source: Selina Concise Chemistry ICSE Class 10, Ch 1 'Periodic Table' (aplustopper.com extract)_
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