Atomic Theory
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Last updated 8:57 PM on 2/17/23
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15 Terms
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John Dalton
elements are all composed with tiny particles called atoms; account for law of conservation of mass and constant composition.
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Law of Conservation of Mass
atoms are neither created nor destroyed
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Law of Constant Composition
elements combine in fixed ratios
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Dalton's Atomic Model
\-uniform shape
\-uniform density
\-indivisible
\-uniform density
\-indivisible
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JJ Thompson
cathode ray tube, discovered the electron
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Thompson's Atomic Model
is charged with positive & negative particle
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Robert Millikan
determined the charge of an electron. Mass of an electron is extremely small. 9.1*10^-28g
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Ernest Rutherford
Gold foil experiment; discovered nucleus; the rest of the atom is empty space
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Rutherford's Atomic Model
empty space with moving electrons; nucleus with protons.
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Gold Foil Experiment
alpha particles that were shot at gold foil were deflected as they passed through because they deflected off the nucleus.
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Bohr
suggest electrons move in set paths around the nucleus. Each shell represents an "energy level"
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Bohr's Atomic Model
planetary model
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Schrodinger
electrons behave like a wave and exist in orbitals. Electrons move very fast, so the location of the electron can not be determined
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orbitals
areas of probability
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Schrodinger's Atomic Model
cloud/wave model