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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.
The atomic number tells you the number of. in one atom of an element. It also tells. you the number of in a neutral atom of that element. The atomic number gives the identity of. an element as well as it's location on the Periodic Table. No two different elements will have the. atomic number. The mass number is used to calculate the number of. calculate the number of neutrons you must subtract the #. in one atom of an elemen. from the.