The mass of proton is 1.0073 u and that of neutron is 1.0087 u (u = atomic mass unit).
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By definition, the mass of the carbon-12 nucleus is 12u, where u is the atomic mass unit (amu), equal to 1.66 x 10^-27 kg. The mass of an isolated proton has been measured to be 1.0073u and that of a neutron is 1.0087u (about 0.14% larger).
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