(L. Rhenus, Rhine) Discovered by Noddack, Tacke and Berg in 1925. Found in gadolinite and molybdenite. Does not occur freely in nature, found largely in the earth's crust.
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transition metal, silvery-white, metallic luster, dense, annealed Re is ductile, fairly expensive
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additive to tungsten and molybdenum for superconductivity, used in scientific instruments, electrical materials, thermocouples, flash lamps in photography, hydrogenation catalysts