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Electronic Configuration of Actinides

Why chromium ...

Question

Why chromium has electronic configuration $3 d^{5} 4 s^{1}$ and not $3 d^{4} 4 s^{2}$ ?
Transition metals form complex compounds :

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Solution

$C r = 24$
Now $C r$ can have $4 s^{2} 3 d^{4}$ or $4 s^{2} 3 d^{5}$

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3 d^{5} 4 s^{1}

3 d^{4} 4 s^{2}

3 d^{4} 4 s^{2}

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