![]() ![]() The history of the development of periodic tables of the chemical elements is briefly reviewed beginning with the presentation by Dmitri Mendeleev and his associate Nikolai Menshutkin of their original 1869 table based on atomic weights. It also marks the 175 th anniversary of his birth in Tolbosk, Siberia. This year (2009) marks the 140 th Anniversary of Mendeleev's original 1869 periodic table of the elements based on atomic weights.
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