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Q.

$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{1} 3 d^{10}$ is electronic configuration of

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a

Fe

b

Cu

c

Mn

d

Ni

answer is D.

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$C u - 30 - 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{1} 3 d^{10}$

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