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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.
To Know the Atomic Number of Elements You can find the atomic number of any element from the periodic table. Atomic number is the number of protons that make up its nucleus, which is equal to the number of electrons revolving around it. In the square denoting every element in the periodic table, the atomic numbers are printed at the top. To Know the Element Names and Symbols Firstly, using the periodic table, you can trace the actual name of an element, from its abbreviated name.