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Contributor Date Contribution Comment Aristotle ~330 BC Four element theory: earth, air, fire & water Antoine Lavoisier ~1770-1789 Wrote the first extensive list of elements containing 33 elements. Distinguished between metals and non-metals. Some of Lavoisier's elements were later shown to be compounds and mixtures. Jöns Jakob Berzelius 1828 Developed a table of atomic weights. Introduced letters to symbolize elements. Johann Döbereiner 1829 Developed 'triads', groups of 3 elements with similar properties. Lithium, sodium & potassium formed a triad. Calcium, strontium & barium formed a triad. Chlorine, bromine & iodine formed a triad. First to think that there may be 'groups'. John Newlands 1864 The known elements (>60) were arranged in order of atomic weights and observed similarities between the first and ninth elements, the second and tenth elements etc. He proposed the 'Law of Octaves'. Newlands' Law of Octaves identified many similarities amongst the elements, but also required similarities where none existed. He did not leave spaces for elements as yet undiscovered. First to think that there may be 'periods'. Lothar Meyer 1869 Compiled a Periodic Table...

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