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The atomic number of $Ni$ and $Cu$ are 28 and 29 respectively. The electronic configuration
$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10}$ represents.

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${Ni}^{2 +}$

$Ni$

${Cu}^{+}$

${Cu}^{2 +}$

answer is A.

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Detailed Solution

Electronic configurations of

$\begin{array}{ll} Ni - [Ar] 3 d^{8} 4 s^{2} {Ni}^{2 +} - [Ar] 3 d^{8} \\ Cu - [Ar] 3 d^{10} 4 s^{1} {Cu}^{+} - [Ar] 3 d^{10} \\ {Cu}^{2 +} - [Ar] 3 d^{9} \end{array}$

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