Why is it that one atom such as hydrogen has one proton while others have many. What is the mechanism driving this force which causes some atoms to be marked for one protons and others for many? And once they are say marked as hydrogen they can be nothing else, correct? Since hydrogen is the simplest of all atoms than would this make hydrogen the most abundant element in all the Universe? And lastly is there a limit to how many protons/electrons/neutrons an atom can possess?