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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.
OBJ: 4.3.3 Calculate the number of electrons, protons, and neutrons in an atom given its mass number and atomic number. NAT: B.1. TOP: Calculate the number of electrons, protons, and neutrons in an atom given its mass number and atomic number. KEY: Mass of individual atoms MSC: 3. NOT: The mass of an atom depends on the number of protons and neutrons. It is expressed in atomic mass units (amu).