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How to Find the Mass Number of an Element

In this video, we’ll explore the concept of finding the mass number of an element using the periodic table or when given protons and neutrons. The key idea is that if you have two of these pieces of information, you can figure out the third. We can use the periodic table to find the number of protons by looking at the atomic number above the element symbol. Mass Number = Protons + Neutrons You may be given problems where you have the mass number and either the protons or neutrons and need to find the missing value. We’ll also address how to do this and talk about how the average atomic mass on the periodic table, found below the element symbol, relates to the mass number.