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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.
For F - , the number of protons (from the periodic table) is 9 and the number of electrons is: 9 + 1 = 10 electrons. Find the Number of Neutrons. To find the number of neutrons in an atom, you need to find the mass number for each element.The periodic table lists the atomic weight for each element, which can be used to find mass number, For hydrogen, for example, the atomic weight is 1.008.ind the Number of Neutrons. To find the number of neutrons in an atom, you need to find the mass number for each element. The periodic table lists the atomic weight for each element, which can be used to find mass number, For hydrogen, for example, the atomic weight is 1.008.