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Q.

Beryllium has 4 electrons with electronic configuration

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a

$1 s^{2} 2 s^{2}$

b

$2 s^{2} 2 p^{2}$

c

$1 s^{2} 2 s^{2} {sp}^{1}$

d

$1 s^{2} 2 p^{2}$

answer is C.

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Detailed Solution

Berylium atomic number is 4 with 1S²2S² electronic configuration

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