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Atomic number definition, the number of positive charges or protons in the nucleus of an atom of a given element, and therefore also the number of electrons normally surrounding the nucleus. Abbreviation: at. no.; Symbol: Z See more.

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Mass number definition, the integer nearest in value to the atomic weight of an atom and equal to the number of nucleons in the nucleus of the atom. Symbol: A See more.

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parts of the atom

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Basic Parts of the Atom - Protons, Neutrons, Electrons, Nucleus