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Typically to find the number of neutrons, you first round the Atomic Mass to the nearest whole number. After that to you subtract the number of protons (which is the same as the atomic number) from the newly rounded atomic mass and the resulting number is the number of neutrons. lets use Carbon for example:

Atomic mass: 12.01

Atomic mass rounded: 12.00

Number of Protons (same as atomic number): 6

(Rounded atomic mass - number of protons)=6

So Carbon has 6 neutrons.

Hope that is easy enough to understand.

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