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

How you can determine the number of neutrons an atom has from an atom's mass number and it's atomic mass?

  • Answer:

    It is impossible to determine the number of neutrons from the mass number and atomic mass, since the two are essentially same value. However, with the atomic number and the mass number, one can calculate the number of neutrons by subtracting the atomic number from the mass number.

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