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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.
Mass number-atomic number = # neutrons. Determining the number of electrons-. The number of electrons in an element can change. For a neutral atom, the number of protons is exactly equal to the number of electrons.So the number of electrons is the same as the atomic number.ass number-atomic number = # neutrons. Determining the number of electrons-. The number of electrons in an element can change. For a neutral atom, the number of protons is exactly equal to the number of electrons.