Uranium is a silvery-white metallic chemical element in the actinide series of the periodic table with atomic number 92. It is assigned the chemical symbol U. A uranium atom has 92 protons and 92 electrons, 6 of the latter are valence electrons. The uranium nucleus binds between 141 and 146 neutrons, giving rise to six isotopes, the most common of which are U-238 (146 neutrons) and U-235 (143 neutrons). None of the isotopes is stable and uranium is weakly radioactive. Uranium has the highest at… (More on Uranium)