How do you calculate the mass of proton or a neutron?

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How do you calculate the mass of proton or a neutron?

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It is very easy if you have a copy of the periodic table of elements handy. The atomic mass is mass of the atom. The mass of an atom is made up primarily by the protons and neutrons. I would round down to the nearest even number. I say to round down because electrons do make up part of the mass, just not very much if it, and divide by two. That is the mass of the protons and the neutrons. Then divide that number by the amount of protons in the atom, and that gives you the mass of one proton. Same thing applies for a neutron.