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11 Cards in this Set
- Front
- Back
Atom
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The smallest unit of an element that maintains the properties of that element
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Electron
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A subatomic particle that has a negative charge
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Nucleus
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In physical science, an atom's central region, which is made up of protons and neutrons
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Electron Cloud
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A region around the nucleus of an atom where electrons are likely to be found
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Proton
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A subatomic particle that has a positive charge and that is found in the nucleus of an atom
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Atomic Mass Unit
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A unit of mass that describes the mass of an atom or molecule
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Neutron
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A subatomic particle that has no charge and that is found in the nucleus of an atom
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Atomic Number
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The number of protons in the nucleus of an atom; the atomic numbe is the same for all atoms of an element
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Isotope
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An atom that has the same number of protons (or the same atomic number) as other atoms of the same element do but that has a different number of neutrons (and thus a different atomic mass)
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Mass Number
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The sum of the numbers of protons and neutrons in the nucleus of an atom
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Atomic Mass
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The mass of an atom expressed in atomic mass units
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