Atomic Structure Question 243

Question: The electronic configuration of copper $ {(_{29}}Cu) $ is

[DPMT 1983; BHU 1980; AFMC 1981; CBSE PMT 1991; MP PMT 1995]

Options:

A) $ 1s^{2},2s^{2}2p^{6},3s^{2}3p^{6}3d^{9},4s^{2} $

B) $ 1s^{2},2s^{2}2p^{6},3s^{2}3p^{6}3d^{10},4s^{1} $

C) $ 1s^{2}.2s^{2}2p^{6},3s^{2}3p^{6},4s^{2}4p^{6} $

D) $ 1s^{2},2s^{2}2p^{6},3s^{2}3p^{6}3d^{10} $

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Answer:

Correct Answer: B

Solution:

3d subshell filled with 5 electrons (half-filled) is more stable than that filled with 4 electrons. $ 1,,4s $ electrons jumps into $ 3d $ subshell for more sability.



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