Dmitri Mendeleev
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Dmitri Mendeleev (born Dmitriy Ivanovich Mendeleyev, February 8 {O.S. January 27) 1834 in Tobolsk – February 2 (O.S. January 20) 1907 in Saint Petersburg) was a Russian chemist. He is said to be the main creator of the first version of the periodic table of elements.