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300
Democritus
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Antoine Lavoiser
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Law of Conservation of Mass
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John Dalton
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Daltons Atomic Theory
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Dmitri Mendeleev
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Cathode Ray Tube
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Plum Pudding Atomic Model
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J.J Thomson
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Robert Milikan
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Rutherford Model
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Henry Mosely
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The Bohr Planetary
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Niels Bohr
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Ernest Rutherford
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Gold Foil Experiment
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Erwin Schrodinger
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Quantum Mechanical Model
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James Chadwick
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Electron Cloud Model