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How did you get four neutrons?

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You find the atomic mass of an element by adding the neutrons and the protons. Therefore when you are looking for the neutrons you can instead subtract the protons from the atomic mass: AM = P + N. N = AM - P. You find the protons by looking at the atomic number at the top and the atomic mass will be found on the bottom. read more

Neutrons do not have a net electric charge, so the number of neutrons does not matter in the calculation. The number of protons of an atom cannot change via any chemical reaction, so you add or subtract electrons to get the correct charge. read more

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