The Probert Encyclopaedia of Science & Technology

URANIUM

Uranium is a silvery, heavy radioactive, polyvalent metallic element that is found especially in pitchblende and Uraninite and exists naturally as a mixture of three radioactive isotopes of mass number 234, 235 and 238 in the proportions of .006%, .71% and 99.28% respectively. Uranium was discovered by Klaproth in 1789, but not isolated until 1840. It has the symbol U.
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