Flashcard 13 - Survey of the Natural Sciences Flashcard Set for the DAT
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Subtract the atomic number from the mass number.
Explanation:
Neutrons are neutral in charge, but have a mass of approximately 1 amu. The atomic number indicates how many protons are in the atom, and protons have a mass of approximately 1 amu as well. By subtracting the atomic number (number of protons) from the mass of the molecule, the number of neutrons can be calculated.
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