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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.
In order to determine the number of protons, neutrons and electrons that are in an atom, the first thing you need to do is find the atomic number and the atomic mass of the element you are interested in. You can use the Periodic Table of Elements to find this information. Let's use mercury as an example: