Question

why the 2s orbital of lithum has greater energy than 2s orbital of sodium​

Answer 1

Yes because as atomic no. increases the energy of same orbital decreases as here 2s of lithium has more energy than 2s of Sodium .
as atomic number increases no.of protons increases thus nuclear charge increase and electrons get more attracted towards nucleus and u know as the radius of electron from nucleus decrease electron get more stable due to low energy .

therefore energy also depends on atomic no. of atoms for Same orbital.

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