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} $
Show Answer
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.
