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Why does the Copper has its exceptional electronic configuration ? ( As electrons filed first with 4s and then 3d orbital ). Please explain in details .

Why does the Copper has its exceptional electronic configuration ? ( As electrons filed first with 4s and then 3d orbital ). Please explain in details . 
 

Grade:12th pass

1 Answers

Vikas TU
14149 Points
3 years ago
Dear student 
When doing the electron configurations for these elements, they are exceptions to the general rule because a completely full or half full d sub-level is more stable than a partially filled d sub-level, so an electron from the 4s orbital is excited and rises to a 3d orbital.
so we'd expect the electron config for copper to be [Ar]3d^9 4s^2 but the element is more stable by having the 3d orbital full than the 4s so thats why the electron config is [Ar]3d^10 4s^1

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