Why the energy of 4s is lower than 3d? – InterviewSolution

1.	Why the energy of 4s is lower than 3d?
Answer» It is according to n+l rule: For 4s, n+l = 4+0=4 & for 3d, n+l = 3+2 = 5, so 4s has lower energy than 3d orbital.

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