Gerhard Carl Schmidt | |
---|---|
Born | |
Died | 16 October 1949 84) | (aged
Nationality | German |
Alma mater | University of Basel |
Known for | discovery of radioactivity in Thorium |
Scientific career | |
Fields | chemistry |
Doctoral advisor | Georg Wilhelm August Kahlbaum |
Other academic advisors | Eilhard Wiedemann |
Gerhard Carl Schmidt (5 July 1865 – 16 October 1949) was a German chemist.
Schmidt was born in London to German parents. He studied chemistry and in 1890 received his PhD for work with Georg Wilhelm August Kahlbaum. In 1898, two months before Marie Curie, Schmidt discovered that thorium is radioactive. [1] Schmidt died of a stroke in Münster 16 October 1949. [2]
Thorium is a weakly radioactive metallic chemical element with the symbol Th and atomic number 90. Thorium is light silver and tarnishes olive gray when it is exposed to air, forming thorium dioxide; it is moderately soft and malleable and has a high melting point. Thorium is an electropositive actinide whose chemistry is dominated by the +4 oxidation state; it is quite reactive and can ignite in air when finely divided.
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