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
 

Thread 'Instantaneous dipole moment and orbitals'

Hi. I have got question as in title. How can idea of instantaneous dipole moment for atoms like, for example hydrogen be consistent with idea of orbitals? At my level of knowledge London dispersion forces are derived taking into account Bohr model of atom. But we know today that this model is not correct. If it would be correct I understand that at each time electron is at some point at radius at some angle and there is dipole moment at this time from nucleus to electron at orbit. But how...
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