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15 Cards in this Set
- Front
- Back
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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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atomic mass
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the weighted average of the masses of the isotopes or an element
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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 number
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the number of protons inthe nucleus of an atom of an element
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cathode ray
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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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Dalton's atomic theory
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the first theory to relate chemical changes to events at the atomic level
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electron
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a negatively charged subatomic particle
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group
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a vertical column of elements in the periodic table, the constituent elements of a group of similar chemical and physical properties
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isotopes
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atoms of the same element have the same atomic number but different atomic masses due to a different number of neutroms
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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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neutron
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a subatomic particle with no charge and a mass or 1 amu, found in the nucleus of an atom
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nucleus
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the tiny, dense central portion of an atom, composed of protons and neutrons
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period
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a horizontal row of elements in the periodic table
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periodic table
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an arrangement of elements in which the elements are separated into groups based on a set of repeating properties
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proton
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a positively charged subatomic particle found in the nucleus of an atom
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