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Cosmological Thesis, everything is made out of water
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Matters smallest piece is an atom.
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Believed everything was comprised of the four main elements.
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Backed Democritus's theory of the atom.
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Atomic theory of matter.
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Discovered radioactivity.
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Discovered electron, cathode ray tube experiment.
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Oil drop experiment which determined mass of electrons and charge. Changed model to the plum pudding model.
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Gold foil experiment to find the nucleous.
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Found that electrons orbit the nucleous.
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Discorved isotopes.
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Created electron clouds.
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Found neutron.