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9 Uranium In science, uranium is a radioactive chemical element with the symbol U and atomic number 92, known for its high density and use as a nuclear fuel. It is an actinide element that occurs naturally in rocks and ores, and its most common isotope, uranium-238, is the heaviest naturally occurring element. The key to uranium's scientific significance is its ability to undergo nuclear fission, a process where its nucleus splits, releasing a large amount of energy