Question

Write electronic configuration of Cu (Z=29). What is the reason for abnormal electronic configuration of Cu?

Answer 1

electronic configuration - 1s22s22p63s23p63d104s1. a) the number of unpaired electrons=1. b) n+1=3 , or n=2 so number of electrons with n=2 is 8.

Answer 2

Answer : The electronic configuration of Cu is,

$1s^22s^22p^63s^23p^64s^13d^{10}$

The reason for abnormal electronic configuration of Cu is due to the fully-filled and half-filled configuration are the more stable.

Explanation :

The element is, copper (Cu)

Atomic number of Cu = 29

The electronic configuration of Cu is,

$1s^22s^22p^63s^23p^64s^13d^{10}$

The reason for abnormal electronic configuration of Cu is because of the half-filled and fully-filled configuration are the more stable configuration. In this configuration, the d-subshell is fully-filled and s-subshell is half-filled which makes the Cu more stable.