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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 formula for finding out the number of neutrons in an atom is atomic mass - atomic number. The intuition behind this hinges on how the atomic mass presented on the periodic table is calculated. The atomic mass of an atom is determined by only the number of protons and neutrons.