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Stable subatomic particle with a charge of negative electricity

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

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An informal term in physics. It is used to describe where electronsare when they go around the nucleus of an atom

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Total number of protons and neutrons in a nucleus

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Two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei,

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Subatomic particle of about the same mass as a proton but without an electric charge.

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Charged central core of an atom

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Each proton has a mass of about 1 amu.

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Located in the nucleus of atom.

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Atoms are chemical elements.