Uranium is the metallic chemical element with an atomic number of 92. Its symbol is U, atomic weight is 238.0, and specific gravity is 18.95. It melts at 2,071.4°F (1,133°C) and boils at 6,904.4°F (3,818°C). Natural uranium consists of three isotopes of mass numbers 234 (0.00054%), 235 (0.711%) and 238 (99.275%). All are radioactive.
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