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Question

Electronic configuration of copper (atomic No.Cu-29) is :
  1. 1s22s22p63s23p63d84s24p1
  2. 1s22s22p63s23p63d94s14p1
  3. 1s22s22p63s23p63d84s14p1
  4. 1s22s22p63s23p63d104s14p0

A
1s22s22p63s23p63d94s14p1
B
1s22s22p63s23p63d84s14p1
C
1s22s22p63s23p63d104s14p0
D
1s22s22p63s23p63d84s24p1
Solution
Verified by Toppr

This is expected that the configuration of copper is 3d94s2. However, it turns out that the 3d104s1 configuration is more stable, because that way the 3d subshell is full, which is a far more stable arrangmemnt than 3d9.
Due to extra stability of half filled and full filled orbital, Cu have configuration 1s22s22p63s23p63d104s14p0.
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