Electronic configuration of `""_(29)Cu` in ground state is :

Options

A. `1s^(2),2s^(2) 2p^(6),3s^(2)3p^(6),4s^(2), 3d^(9)`
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),5s^(2)5p^(1)`
D. `1s^(2),2s^(2)2p^(6),3s^(2)3p^(6),4s^(2)4p^(6),3d^(3)`

Answer

B

Explanation

(b) The electronic configuration of Cu (29) is an exceptional case due to exchange of energy and symmetrical distribution of electrons in orbital to acquire more stability.
Cu(29)=

`=1s^(2), 2s^(2) 2p^(6), 3s^(2) 3p^(6) 3d^(10), 4s^(1)`