How do you find the number of neutrons in an atom?

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mass number - atomic number
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If you know the mass number and atomic number of the atom, the number of neutrons is just the difference between them. For example, in a carbon-13 atom, the atomic number is six and the mass number is thirteen, so the number of neutrons is seven.
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If you know the mass number and atomic number of the atom, the number of neutrons is just the difference between them.
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