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Why does 2s have less energy than 1s if they have the same principal quantum number?
principal quantum number
thing fully determining energy is only true for the
hydrogen emission spectrum
for which we can solve the
For other atoms with more than one electron, the orbital names are just a very good approximation/perturbation, as we don't have an explicit solution. And the internal electrons do change energy levels.
Note however that due to the more complex effect of the
, there is actually a very small 2p/2s shift even in hydrogen.
Solutions for the Schrodinger equation with multiple particles
Solutions of the Schrodinger equation
Non-relativistic quantum mechanics
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