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The number of neutrons in an atom is easily calculated by taking the mass number and subtracting the atomic number.

Take for example, Uranium: the mass number on the Periodic Table is 238, while the atomic number is 92. Take the difference of 238 and 92 and that will be equal to the number of neutrons.

238-92=146

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subtract the atomic number from the atomic weight

Take the atomic mass and round it to the nearest whole number. Then subtract this number and the atomic number of that element.

Subtract the atomic number from the isotope mass number.

The number of neutrons is the difference between mass number and the number of protons.

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Subtract the atomic number from the atomic mass.

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mass number minus the atomic number

Q: How do you calculate how many neutrons there are in an atom?

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