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Conventional neutron numbers are based on the approximations that the mass of the electron is zero and that those of the proton and neutron are each equal to unity. It was shown, by using the exact rest masses, that the neutron numbers are actually one or two less than the conventional ones for atomic masses greater than 108. Presented here are new equations for the atomic mass, mass per nucleon and mass defects for the most abundant stable isotope (or the one with the longest half life) of each of the 118 elements of the Periodic Table.

New Equations for Atomic Mass, Mass per Nucleon and Mass defects of Elements in Terms of Rest Mass Based Neutron Numbers