Chemistry, Inorganic Fe-Organoiron Compounds 6 Uranium 5 Eisen 4 Fluor 4 Rare Earth Elements 4 Sc, Y, La-Lu 4 Thorium 4 Vanadium 4 Wolfram 4 Beryllium 3 Blei 3 Ferrocen 3 Gold 3 Iron 3 Kalium 3 Molybdenum 3 Nickel 3 Platin 3 Schwefel 3 Tantal 3 Uran 3 Aluminium 2 Barium 2 Bor 2 Boron compounds 2 Cadmium 2 Chlor 2 Cu, Organocopper Compounds 2 Eisen-Organische Verbindungen 2