What Do the Numbers Mean in the Periodic Table?
The numbers in the periodic table represent the atomic number of each element, which is the number of protons in the nucleus of an atom.
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It's all about protons! The atomic number equals the number of protons in the element's nucleus.
Those numbers? They're the atomic numbers. Each element has a unique one that shows how many protons it has.
Atomic number tells you how many protons are in an atom's nucleus. For example, hydrogen has one atomic number because it has one proton.
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