Somewhere I read that spin quantum number is a particularly interesting theory of quantum mechanics as what it really implies is that particles like electrons do not come back to the initial state of observation after one rotation, but if they rotate 2 times then the same state is obtained. Is it really so?
Even if it/or it is not why do the electrons need two types of spin quantum number? Are two electrons in same orbital supposed to rotate in opposite direction?
But then I also hear that electrons are particles and since particles cannot have an axis of rotation they do not actually rotate hence do not "spin". Another proof of this was that the observed magnetic moment of electron is much more than what was expected theoretically from the spinning of electrons hence definitely some phenomenon other than just spinning/rotating must take place.