Protons have a charge of +1, and a mass of approximately 1 atomic mass unit (amu). Elements differ from each other in the number of protons they have, e.g. Hydrogen has 1 proton; Helium has 2.
electron atomic mass unit charged particles in the shells or S the mass I/ ceo than off an is that of a proton , so it does not add si mass to the OM than of an electron
