text: 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 , of which 6 are valence electrons .
simplified: It has an atomic number of 92 , which means that a uranium atom has 92 protons in its center , which is called a nucleus .