Energy of atomic orbitals in multielectron system

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although the distance from the nucleus and shielding effect [due to more angular volume] is more for 4s orbital than a 3d orbital ,but yet the energy for a 3d orbital is more than 4s orbital, why?
 

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Welcome to PF;
You mean as in:

Energy_Level_Diagram.png


It is due to angular momentum and spin.
http://antoine.frostburg.edu/chem/senese/101/electrons/faq/4s-3d.shtml
 

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