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Which element shows valency 7?

ASodium
BAluminium
CChlorine
DArgon
Answer & Solution
Correct answer: C. Chlorine
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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