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Head Elements (Group 1)

Which element...

Question

Which element has valency equal to its group number?

A

Sodium

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B

aluminium

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C

oxygen

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D

carbon

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Solution

The correct option is A Sodium
Sodium having atomic number 11, its electronic configuration is $(N a) 11 - 1 s_{2} 2 s_{2} 2 p_{6} 3 s_{1}$
therefore sodium contains one valence electron and having group no. first.

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