An element with configuration $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{2}$ is ?

trivalent

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tetravalent

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pentavalent

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both tri and pentavalent

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Solution

The correct option is D tetravalent
$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{2}$

Outermost electron = $2 + 2 = 4$

tetravalent atom.

Option B is correct.

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