Main Question or Discussion Point
Does Hund's rule also apply when combining the angular momenta of electrons from shells with DIFFERENT quantum number n?
If it's true in two cases, it's true in all (in this case)Originally posted by salsero
Suppose there are n electrons with angular momentum quantum numbers L1, L2, L3, ..., Ln. The total angular momentum L of the atom can be any number between the minimum and the maximum of all non-negative combinations +/- L1 +/- L2 +/- L3 ... +/- Ln (in steps of 1). Same about combinations of the spin (the spin quantum numbers of the single electrons are always 1/2) to the total spin S of the atom.
Hund's rule says that the lowest-energy state among all the possible states is the state which has the greatest S and the greatest L (for that S).