. The electronic configuration of Cu is


A: [ Ne ] 3s2,3p6,3d9,4s2

B: [ Ne ] 3s2,3p6,3d10,4s1

C: [ Ne ] 3s2,3p6,3d3,4s2,4p6

D: [ Ne ] 3s2,3p6,3d5,4s2,4p4

 

Best Answer

Explanation-

Expected electronic configuration of copper (Cu) by Aufbau’s principle is

1s2 2s2 2p6 3s2 3p6 3d9 4s

Due to stability of half or fully filled orbitals one electron from 4s moves to 3d orbital 

Actual electronic configuration of copper (Cu) is 

1s2 2s2 2p6 3s2 3p6 3d10 4s1 or [Ne] 3s2 3p6 3d10 4s1

Final Answer-

So, The correct option is B.

The electronic configuration of Cu is-[ Ne ] 3s2,3p6,3d10,4s1

 

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