1.2: Atomic Structure - The Nucleus - Chemistry LibreTexts
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WebJan 15, 2023 · It is not the atom's relative mass, as we will see in the section on isotopes below. It is, rather, the number of protons in the nucleus, which we call the atomic number and denote by the symbol Z. Each proton carries an electric charge of +1, so the atomic number also specifies the electric charge of the nucleus.
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