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Uranium is a silvery-white metallic chemical element in the actinide series of the periodic table, with symbol u and atomic number 92. a uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons. uranium is weakly radioactive because all its isotopes are unstable. the most common isotopes of uranium are uranium-238 (which has 146 neutrons) and uranium-235 (which has 143 neutrons).