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14 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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Dalton's atomic theory
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the first theory to relate chemical changes to event at the atomic level.
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Electrons
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negatively charged subatomic particles,-1.
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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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Protons
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positively charged subatomic particles, mass of 1/1840 times of an electron,+1
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Neutrons
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are subatomic particles with no charge, mass almost = to proton, 1,neutral
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nucleus
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the tiny central core of and atom ans is composed of protons and neutrons
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atomic number
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the number of protons in the nucleus an element
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mass number
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the total number of protons and neutrons in an atom
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atomic mass unit (amu)
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is defined as one twelfth of the mass of carbon-12 atom.
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atomic mass
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weighted average mass of an element
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periodic table
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arrangement of elements in which the elements are seperated into groups based on a set of repeating properties (allows you to easily compare the properties on one element to another element).
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period
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horizontal ROW on the periodic table
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group
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FAMILY vertical columns, where in each they have similar chemical and physical properties.
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