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10 Cards in this Set

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