Why is the electronic configuration of chromium 1s22s22p63s23p64s13d5 and not 1s22s22p63s23p64s23d4-

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why is the electronic configuration of chromium 1s²2s²2p⁶3s²3p⁶4s¹3d⁵ and not 1s²2s²2p⁶3s²3p⁶4s²3d⁴?

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1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{4}

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

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

_{24} C r - [A r] 3 d^{5} 4 s^{1}

_{29} C u - [A r] 3 d^{10} 4 s^{1}

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