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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.
Atoms must have equal  number of protons and electrons. To find  the number of neutrons you must find is  something called the mass number. Unfortunately,  the mass number isn't listed on the Table of  Elements. To find the mass number, all you need to  do is round the atomic weight to the nearest whole  number.he number of electrons in an element can change. For a neutral atom (net charge of zero), the number of protons is exactly equal to the number of electrons. So the number of electrons is also the same as the atomic number. However, it is possible to remove electrons and not change the identity of an element.