Which of the following is electronic configuration of ${Cu}^{2 +} (Z = 29) ?$

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$[A r] 4 s^{1} 3 d^{8}$

$[A r] 4 s^{2} 3 d^{10} 4 p^{1}$

$[A r] 4 s^{1} 3 d^{10}$

$[A r] 3 d^{9}$

answer is D.

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Detailed Solution

$\begin{array}{l} C u : 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10} 4 s^{1} . \\ ∴ C u^{2 +} : 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{9} o r [A r] 3 d^{9} . \end{array}$

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