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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.
Best Answer: The atomic number of an element tells us the Number of protons in the atom. For e.g Atomic number of sodium(Na) is 11 which means it has 11 protons. electrons have the same number as the number of protons. To find neutrons you need to subtract number of protons from the atomic weight of the atom.he number of protons and electrons (in a neutral atom) are equal to the atomic number of the atom. For example in a, the number of protons and electrons in magnesium is 12.