exam practise question: what are the physical observables determined by the quantum numbers n, l, ml and ms of the electron in a hydrogen atom. most places just give the equation or the name not the physical observable determined. so is this right?:- n = principal number determines the energy state that th atom is in l = azimuthal number i know is to do with the orbital angular momentum, does this determine the angular momentum state? ml = magnetic quantum number associated with angular momentum ms = magnetic quantum number associated with spin and if we have spin +1/2 then the electron will have a higher energy then if it was -1/2 and thats all i know. any help would be great.