how is the atomic number related to the number of electron
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The atomic number uniquely identifies a chemical element. It is identical to the charge number of the nucleus. In an uncharged atom, the atomic number is also equal to the number of electrons. The sum of the atomic number Z and the number of neutrons N gives the mass number A of an atom.
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The atomic number of an element is similar to the number of protons in the nucleus of every atom, which also means the number of electrons if uncharged.
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