DMITRY MENDELEYEV (b. 1834–d. 1907)The periodic table of the elements used in chemistry was devised by the Russian scientist Dmitry Mendeleyev (also spelled Dmitri Mendeleev). His final version of the table in 1871 left gaps, suggesting that other elements would later be discovered. He also predicted the characteristics of these unknown elements.
Dmitry Ivanovich Mendeleyev was born in Tobolsk, Siberia, on February 8, 1834. After his father's blindness and death in 1847, his mother operated a glass factory. When the factory was destroyed by fire, the family moved to Moscow and later to St. Petersburg, where Dmitry attended the Pedagogical Institute. He qualified as a teacher in 1855 and was sent south to Odessa to continue studies in chemistry. He received his first university post in 1857 and was sent to the University of Heidelberg (1859–61) for further study. Once back in St. Petersburg he took up editing and scientific writing. He became a professor of chemistry at the Technical Institute in 1864. His textbook, The Principles of Chemistry, was published in 1868–70...