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Created the Atomic Theory
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Created the Law of Definite proportions.
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Built one of first Cathode Ray tubes
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developed 1st periodic table of elements
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Discovery of electrons and plum pudding model
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Determined the charge of an electron
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Electron cloud model and established that the nucleus is small and dense
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Uses x-ray tubes to determine charge of nuclei
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Discovered isotopes
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Proved the existence of neutrons
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discovered nuclear fission, in which the nucleus of an atom breaks up into two separate nuclei, while experimenting with uranium.
