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400 BCE
Democritus
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350 BCE
Alchemists
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270 BCE
Cathode Ray Tube
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Joseph Louis Proust
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John Dalton
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Law of Definite Proportions
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Antoine Lavoisier
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Law of Conservation of Mass
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Dalton’s Atomic Theory
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Dmitri Mendeleev
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Henry Moseley
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J.J Thomson
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Plum Pudding Atomic Model
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Werner Heisenberg
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Gold Foil Experiment
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Oil Drop Experiment
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Robert Millikan
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Nuclear Model
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Ernest Rutherford
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Niels Bohr
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Planetary Model
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Erwin Schrodinger
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Quantum Mechanical Model
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James Chadwick