Question

why elcetronic configuration of cu and cr a execption ???? plz help me.......​

Answer 1

Hey brainly user

Here is your answer

Electronic configuration

$cu(z = 29) = 1s {}^{2} 2s {}^{2} 2p {}^{6} 3s {}^{2} 3p {}^{6} 4s {}^{1} 3d {}^{10}$

$cr(z = 24) = 1s {}^{2} 2s {}^{2} 2p {}^{6} 3s {}^{2} 3p {}^{6} 4s {}^{1} 3d {}^{5}$

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