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If you are asking how the number of neutrons in the nucleus of an atom is calculated, here is how: You need to find the mass number of the atom. Take the mass number and subtract the atomic number (number of protons) from it. what number you have left is the number of neutrons in the nucleus. For example: Neon has a mass number of 20 and an atomic number of 10.

20 - 10 = 10.. so the amount of neutrons in the nucleus of Neon would be 10.

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16y ago

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