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10 Cards in this Set
- Front
- Back
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atomic theory
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explanation of the structure of matter in terms of different combinations of very small particles
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atom
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extremely small particle of matter that retains its identity during chemical reactions
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element
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type of matter composed of only one kind of atom
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compound
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type of matter of atoms of two or more elements chemically combined in fixed proportions
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chemical reaction
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rearrangement of the atoms present in the reacting substances to give new chemical combinations present in the substances formed by the reaction
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atomic symbol
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one or two letter notation used to represent an atom corresponding to a particular element
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law of multiple proportions
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when two elements form more than one compound, the masses of one element in these compounds for a fixed mass of the other element are in ratios of small whole numbers
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nucleus
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atoms's central core, which is positively charged and contains most of the atom's mass
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electron
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very light, negatively charged particle that exists in the region around the atom's positively charged nucleus
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J.J. Thomson
(cathode, anode) |
showed that atoms were not indivisible particles
cathode: negative electrode anode: Positive electrode |
