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Why is the electron configuration for copper 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 10 4 s 1 instead

of 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 9 4 s 2 ?  

A The 4 s orbital has higher energy than the 3 d orbital.


B Electrons occupy orbitals of the highest energy levels first.

C A filled sublevel is more stable than a half-filled sublevel.

1 Answer

13 votes
The answe is B, because electrons occupy orbitals of high energy levels first
User Fabian Boulegue
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