Out of 3d and 4s orbitals . which filled first and why?
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4s filled first because according to n+l rule for 3d=3+2 which is 5
But for 4s=4+0which is 4
n+l rule say which is filled first which has lower value
I think it will help you.
But for 4s=4+0which is 4
n+l rule say which is filled first which has lower value
I think it will help you.
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