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Manuscript of Mendeleev's first periodic system of elements, 17 February 1869. Dmitry Mendeleyev , Russian chemist who formulated the Periodic Table...
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Periodic table of elements, Table created by Dmitry Mendeleyev in 1869 that classifies the known chemical elements. The elements are classified in...
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Two scientists use a massive, illuminated periodic table of elements as they discuss the element holmium in the Lawrence Hall of Science at the...