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a postive or negtive elementary charge

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the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.

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the total number of protons and neutrons in a nucleus.

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the mass of an atom of a chemical element expressed in atomic mass units

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a unit of mass used to express atomic and molecular weights, equal to one-twelfth of the mass of an atom

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each of two or more forms of the same element that contain equal numbers of protons but different numbers

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no net electric charge and a mass slightly larger than that of a proton. Protons and neutrons

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It is used to describe where the electrons are

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a stable subatomic particle

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the central and most important part of an object

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the smallest molicule