1. The problem statement, all variables and given/known data Why doesn't the energy of the hydrogen atom depend on quantum numbers l or m? 2. Relevant equations E = (Z^2) 13.6 eV / n^2 3. The attempt at a solution Regarding l: I know that it has to do with the inverse-square law between the distance, r, of the e- and the nucleus' force exerted on the e-.... I also know that it has to do with the fact that there is only 1 e- orbiting H... But can someone elaborate on exactly what happens when more e- are introduced? Is it that another e- can interfere with the "pull" felt by the outer e- and exactly HOW much it interferes is dependent upon the angular momentum number, l? Regarding m: ???