Atom But????? I am studying atom and I reach the Bohr model & the quantum theory of atom for now. But I have some point that I don’t understand for example: 1st We assume that the positive charge (protons) and 99% of the mass (neutrons) are stable, (in most cases), in the center of the atom .And the negative charge are moving around it. If the Proton and the neutron have spin, how they maintain the stable and constant state in the atom, if they have spin. 2nd if the neutron and the proton have spin of n for proton and m for neutron how do they don’t effect each other spins (I mean how the m spin don’t effect the n spin).