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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.
Rawan and 1 other Share. Mar 26, 2016. 47. Atomic number is the number of protons or electrons in an atom, for example, the Atomic number of hydrogen is 1 so this means that hydrogen has 1 proton and 1 electron.