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