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Electronic Configuration and Oxidation States

Which of the ...

Question

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

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

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

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

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[A r] 3 d^{9}

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Solution

The correct option is D $[A r] 3 d^{9}$
$C u (Z = 29) : [A r] {4 s}^{1} 3 d^{10} C u^{2 +} (Z = 27) : [A r] 3 d^{9}$

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