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Atomic mass - Wikipedia ... Atomic mass
Relative atomic mass
Dalton (unit) - Wikipedia ... Dalton (unit)
Atomic units - Wikipedia ... Atomic units
Mass number - Wikipedia ... Mass number
Atom - Wikipedia ... Atom
Standard atomic weight
A proton is a stable subatomic particle, symbol. p. , H +, or 1 H + with a positive electric charge of +1 e (elementary charge). Its mass is slightly less than the mass of a neutron and approximately 1836 times the mass of an electron (the proton-to-electron mass ratio). Protons and neutrons, each with a mass of approximately one atomic mass ...