Electronic configuration of copper is?

[A r] 4 s^{2} 3 d^{9}

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

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

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[A r] 4 s^{2} 3 d^{7}

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Solution

The correct option is B $[A r] 4 s^{1} 3 d^{10}$
Electronic configuration of copper.
Atomic number of Cu = $29$
${1 s}^{2} {2 s}^{2} {2 p}^{6} {3 s}^{2} {3 p}^{6} {4 s}^{1} {3 d}^{10}$
or $A r {4 s}^{1} {3 d}^{10}$
Electron from $4 s$ shifts into $3 d$ orbit for stabilization. Attains stabilization with half filled and full filled orbit.

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The electronic configuration of chromium in [Cr(NH₃)₆]³⁺ is:

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