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The first scientific discovery of an element occurred in 1649 when Hennig Brand discovered phosphorous.
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Joseph Black isolated carbon dioxide, which he called fixed air.
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Henry Cavendish discovered hydrogen as a colorless, odourless gas that burns and can form an explosive mixture with air
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Antoine Lavoisier wrote the first extensive list of elements containing 33 elements & distinguished between metals and non-metals
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20 elements found
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John Dalton proposed "Dalton's Law" describing the relationship between the components in a mixture of gases.
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Johann Dobereiner developed groups of 3 elements with similar properties
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Lothar Meyer develops an early version of the periodic table, with 28 elements organized by valence
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By 1869, a total of 63 elements had been discovered. As the number of known elements grew, scientists began to see patterns in the properties of elements and began to develop classification schemes.
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William Ramsay discovered the Noble Gases.
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Bequerel discovered that electrons and beta particles as identified by the Curies are the same thing.
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Henry Moseley determined the atomic number of each of the elements and modified the 'Periodic Law'.