Ch 4/5 Vocab regents chem

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atom

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the smallest particle of an element that retains its identity in a chemical reaction

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electrons

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negatively charged subatomic particles

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protons

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positively charged subatomic particles

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neutrons

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subatomic particles with no charge but with a mass nearly equal to that of a proton

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nucleus

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the tiny central core of an atom and is composed of protons and neutrons

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atomic number

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number of protons in the nucleus of an atom

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mass number

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the total number of protons and neutrons in the nucleus of an atom

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isotopes

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atoms with the same number of protons but different numbers of neutrons

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atomic mass unit

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a unit of mass equal to one-twelfth the mass of a carbon-12 atom

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atomic mass

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a weighted average mass of the atoms in a naturally occurring sample of the element