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Johan Gottlieb Gahn

Swedish chemist and metallurgist
Johan Gottlieb Gahn was a Swedish chemist and metallurgist who isolated manganese in 1774. Gahn studied in Uppsala 1762 – 1770 and became acquainted with chemists Torbern Bergman and Carl Wilhelm Scheele. Wikipedia
Born: August 19, 1745, Hälsingland, Sweden
Died: December 8, 1818 (age 73 years), Falun, Sweden
Discovered: Manganese and Selenium