So it is down to guessing now?So what makes one particle heavier than another? Will a particle with more charge weigh more than one with less charge? Will a particle containing more electrons be heavier than one with less electrons? Or do more positrons make it weigh more instead? Or is it the total of both that matters? Or is it a combination of the total number of electrons and positrons and the net charge on the composite particle that determines the mass?Maybe (total number of positrons and electrons) to (charge) ratio ?