How to determine which energy level is greater which is lower by their term symbols?

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Why are the velocities so high in my Boussinesq approximation Fluent simulation?

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Why almost every element would be metallized in sufficiently high pressure and low temperature?

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How Relativistic effects is one reason for lanthanide contraction?

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Biswanath Rath

@Kotov

My suggestion is that pl understand the spectra of Alkali atoms from any text book on

Atomic and Molecular spectra . After that apply your problem. Spectra nature can be

understood directly from Symbol but requires some practice/ detail analysis.

Prof B.Rath

Dmytro Kotov

Thank you for your answer. So it is not possible to sum up some values to get the relation between the levels? For instance in basic chemistry course to remember which level is higher which is lower(for example 6s and 4f) we used such rule: s=0, p=1, d=2, f=3. And E(6s)=6+0=6, E(4f)=4+3=7. So 4f is higher then 6s.