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4
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a unit of mass equal to one-twelfth the mass of a carbon-12 atom
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5
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the weighted average of the masses of the isotopes of an element
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6
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a subatomic particle with no charge and a mass of 1 amu; found in the nucleus of an atom
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7
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the tiny, dense central portion of an atom, composed of protons and neutrons
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8
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the number of protons in the nucleus of an atom of an element
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9
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the total number of protons and neutrons in the nucleus of an atom
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10
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a stream of electrons produced at the negative electrode (cathode) of a tube containing a gas at low pressure
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11
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A negatively charged subatomic particle
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12
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positively charged particle in the nucleus of an atom
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