I just recently read about the existence of internuclear forces as the reason for the nucleus to remain 'stable' as in it doesn't separate out into protons and neutrons even though there is electronic repulsion between protons and electronic attraction between an electron and a proton. But I still wasn't able to figure out why or due to what it exists.
Also, I read that the internuclear force acts on a proton-proton pair,proton-neutron pair and a neutron-neutron pair, but then what about Hydrogen, as it contains only one proton, so why does it still have a stable nucleus? And since it's nucleus is just a positive charge and there is just one negative charge at a very small distance, shouldn't the electron be attracted towards the proton(even the shielding effect is negligible) to reduce the potential energy due to the field between the proton and the electron and thus achieve the lowest possible potential energy state?