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Electronic configuration of an element 13 in the sub...

Electronic configuration of an element 13 in the subsidiary energy level is

A.

$1s^2 2s^2 2p^6 3s^2 3p^1$

B.

$1s^22s^2 2p^4 3p^1 3s^1$

C.

$1s^2 2s^2 2p^6 3s^2 3p^3$

D.

$1s^1 2s^2 2p^6 3s^2 3p^4$

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Correct answer is A

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