CHEMISTRY: ATOMS
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14 Terms
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atom
the smallest particle of an element
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atomic mass
the average mass of all the isotopes of a element
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atomic mass unit
a unit used to express atomic weight and is equal to 1/12 the mass of a carbon - 12 atom
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atomic number
the number of protons in the nucleus of an atom
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electron
a particle of matter with a negative charge
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element
pure substances that cannot be broken down or decomposed into simpler substances by chemical means
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isotope
forms of an element that the same protons but differing neutrons
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mass number
the total number of protons and neutrons in the nucleus of an atom
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neutron
particle that has no charge in the nucleus of an atom
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nucleus
dense; positively charged central core of an atom
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orbital
region in an atom in which an electrons are located
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proton
particle with a positive charge
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valence electrons
electrons on the outer level of an atom
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wave - mechanical model
the current model of the atoms that deals with the wave - particle duality of nature
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