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Joseph Black isolated carbon dioxide
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Henry Cavendish discovers hydrogen
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Carl Wilhelm Scheele and Joseph Priestly both isolated oxygen
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Antoine Lavoisier creates first list of elements (33)
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Jakob Berzelius develops atomic weights and chemical symbols
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John Newlands arranges known elements
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Lothar Meyer creates periodic table with 28 elements ordered by valence
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Dmitri Mendeleev produces periodic table arranged by atomic weight (66)
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William Ramsay discovered the Noble Gases
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Marie and Pierre Curie isolate radium and polonium
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Ernest Rutherford discovers the source of radioactivity as decaying atoms
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Henry Moseley found the atomic number of each of the elements
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Glenn Seaborg synthesised transuranic elements