Gravity is the weakest force.And it is proportionate to mass.The more massive something is the more gravity it has.As far as gravity between two very small particles/objects/atoms it seems to me that the attraction implies that on a subatomic level each particle/atom "possesses" a differentail force which can be defined as:four halves of two wholes....that is to say that the particles do not posses logical + and - ...the particles/atoms can be the same and they will still have gravity...meaning one atom/particle with a + charge would become surrounded with atoms/particles with - charges and ...all massive objects would be made of reversing layers of + and -.But that is not what happens.The mass is accumulated randomly with whatever particle/atom is available.But the direction of gravity always points to the center...meaning that although the particles are not polarized the force which they emit is.My idea is that there are 4 subparticles in every atom that are arranged in a lattice(stacked) and resinate a batch wave which orients itself at somewhere around 270 degrees opposite any given center.So from 1 degree to approximately 90 degrees the nuclei has a "standing wave".