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Uranium (U)

A radioactive metallic element found naturally only in combination with other substances. Uranium 238 (U-238) is the most common form, but about 0.7 percent of natural uranium is present as U-235, which is the important fissionable component in work with atomic energy.

Uranium in natural water exists as anionic complexes UO2(CO3)22- and UO2(CO3)34-.