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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 of 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 in the 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 have similar chemical and physical properties
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Isotopes
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Atoms of the same element that have the same atomic number but different atomic masses due to a different number of neutrons
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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 of 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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