| http://www.w3.org/ns/prov#value | - Thus, metals of Group 1 (alkali metals), including sodium, potassium and cesium; Group 2, especially the alkaline earth metals magnesium, calcium or barium, may be used together with the transition metal component as well as the rare earth metals including scandium, yttrium and lanthanum and the 14 lanthanides: cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, d
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