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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.
6. Subtract the atomic number from the atomic mass. Because electrons have very little mass, the majority of an atomâs mass comes from the protons and neutrons. Since you know the number of protons from the atomic number, you can subtract that from the atomic mass to find the number of neutrons.ocate the elementâs atomic number. Atomic number is the number of protons that make up a single atom of that element. The atomic number can be found above the element symbol, in the upper left-hand corner of the square. Protons are positively charged particles in the nucleus of an atom.