Clemens Winkler
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Clemens Alexander Winkler (December 26, 1838 - October 8, 1904), a German chemist, discovered the element Germanium in 1886. This discovery solidified Dmitri Mendeleev's theory of periodicity. Mendeleev's thoughts on the element came really close to what the actual element was like.
Winkler was born in 1838 in Freiberg, Saxony, Germany. His father was a chemist too. When he entered the Freiberg University of Mining and Technology at age 19, his knowledge of the subjects surpassed what he was taught there. Sixteen years after he attended the school, he was appointed a professor at Freiberg. He died in 1904 in Dresden.