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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.
Atomic number is the number of protons in the nuclei of the atoms of a given element. The elements on the periodic table are arranged according to increasing atomic number. Foâ¦r example, carbon's atomic number is 6, so it has 6 protons in the nuclei of all of its atoms. Mass number is the number of protons and neutrons in the nuclei of the atoms of a particular isotope of an element.