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# of neutrons = Mass Number - Number of Protons. To be able to apply this formula, refer to the atomic number and atomic weight of the elements. These two are listed in the Periodic Table of Elements. Take note that atomic number refers to the number of protons in an atom of an element.
The mass number is the sum of protons and neutrons in the nucleus. The atomic number is the number of protons. Therefore, you can subtract the atomic number from the mass number to find the number of neutrons. For example, Carbon's atomic number/number of protons is 6 and the mass number is 12.011.This means there are 6 neutrons (approximately).herefore, you can subtract the atomic number from the mass number to find the number of neutrons. For example, Carbon's atomic number/number of protons is 6 and the mass number is 12.011. This means there are 6 neutrons (approximately).