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Atom Vocabulary

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Across
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The basic unit of a chemical element
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A stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids
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The mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundance of different isotopes
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Used to describe where electrons are when they go around the nucleus of an atom
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A subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen
Down
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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 central part of the atom; it contains the protons and neutrons
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A stable subatomic particle occurring in all atomic nuclei, with a positive charge equal in magnitude to that of an electron, but of opposite sign