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To find the number of neutrons to include in the model of an atom, you should **subtract the atomic number from the mass number**.
The atomic number represents the number of protons in the nucleus of an atom, and the mass number represents the sum of protons and neutrons. Thus, the formula to find the number of neutrons (N) is:
\[ \text{N} = \text{Mass Number} - \text{Atomic Number} \]
So, the correct statement is: **"Subtract the atomic number from the mass number."**