uranium
Instance URI: http://resource.geosciml.org/classifier/cgi/commodity-code/uranium
Within scheme: South Australian Commodity Codes
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 (with half-lives of the 6 naturally known isotopes, U-233 & U-238, varying between 69 years and 4½ billion years).