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The number of protons in the nucleus of an atom; the atomic number is the same for all atoms of an element.

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A unit of mass that describes the mass of an atom or molecule; it is exactly 1/12 of the mass of a carbon atom with mass number 12.

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A region around the nucleus of an atom where electrons are likely to be found.

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The sum of the numbers of protons and neutrons in the nucleus of an atom.

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An atom that has the same number of protons (or the same atomic number) as other atoms of the same element do but that has a different number of neutrons (and thus a different atomic mass)

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A subatomic particle that has a negative charge.

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A subatomic particle that has no charge and that is located in the nucleus of an atom.

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In physics, in physical science, an atom's central region, which is made up of protons and neutrons.

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The mass of an atom expressed in atomic mass units.

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A subatomic particle that has a positive charge and that is located in the nucleus of an atom; the number of protons in the nucleus is the atomic number, which determines the identity of an element.

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The smallest unit of an element that maintains the properties of that element.