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The number of neutrons in the nucleus in any atom varies, however, the average is easy to find. The atomic number is the number of both protons and electrons. The Atomic Mass is the number of AMUs (atomic mass units) in the atom. 1 amu is the same as the mass of 1 proton or 1 neutron. the mass of the electrons is negligible. Because of this, subtract the atomic number from the atomic mass and you should have the average number of neutrons.

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