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discovered indivisible units called atoms.
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Dalton revived atomic theory
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Built first cathode ray tube.
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Discovered existence of the electron.
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discovered that most of the atom is empty space using the famous "Gold Foil Method".
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explained emission spectrum of hydrogen atom.
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proved existence of neutrons.
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discovered that you can split an atom.
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Otto hahn and Fritz Strassmann discovered fission, the key factor in nuvlear weapons.
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Atomic bomb built.
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formulated equation that describes behavior and energies of submicroscopic particle in general.