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Joseph Priestly first discovered oxygen
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Humphry Davy
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John Dalton discovered the Atomic Theory
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Italian chemist Amedeo Avogadro finds atoms in elements form into molecules
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Friedrich Woehler accidentally synthesizes urea from inorganic material
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Friedrich Kekule figures out the chemical structure of benzene
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Marie and Pierre Curie discover and isolate radioactive materials
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J.J. Thomson discovers that the negatively charged particles
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Niels Bohr publishes his model of atomic structure
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Dmitry Mendeleyev