Which element shows valency 7?
ASodium
BAluminium
CChlorine
DArgon
Answer & Solution
Correct answer: A. Sodium
1. Chlorine has 7 valence electrons (Group 17).
2. Its valency = 8 - 7 = 1 in most compounds.
3. But chlorine also exhibits valency 7 in higher oxoacids like HClO4.
4. So chlorine can show valency 7.
_Source: Selina Concise Chemistry ICSE Class 9, Ch 5 'The Periodic Table'_
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