Defne "Atomic number"
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the number of protons in the nucleus of an atom, which is characteristic of a chemical element and determines its place in the periodic table.
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Now you know that atomic number = number of protons, and mass number = number of protons + number of neutrons. To find the number of neutrons in an element, subtract the atomic number from the mass number. Here are a couple example: A single helium (He) atom has a mass number of 4 and an atomic number of 2.
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