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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.
Scientists use the term atomic number to describe the number of protons in one atom of an element. For example, the atomic number of hydrogen is 1. If you've ever taken a chemistry class, you've seen a chart called the periodic table of elements.. It lists every chemical element and each element's atomic number. Just by looking at the table, you can see that the atomic number of oxygen is 8 â this means that there are eight protons in one atom of oxygen. In chemistry and physics, the atomic number is represented by the letter Z.