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Uranium: silver-white metallic chemical element in the actinide series of the periodic table, U, atomic number 92; weakly radioactive because all its isotopes are unstable; most common isotopes: uranium-238 and uranium-235; 2nd highest atomic weight of the primordially occurring elements, lighter only than plutonium

92 U 鈾 Uranium, named after the planet Uranus, which had been discovered few years earlier. it's weakly radioactive and occurs naturally in low concentrations of a few parts per million in soil, rock and water.