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</html><description>Protactinium is een van de zeldzaamste chemische elementen in de natuur. In de aardkorst bestaat het uit ongeveer 0,00001 delen per miljard. Het is ook verkrijgbaar in pekblende met ongeveer 0,1 delen per miljoen. Dit maakt het een materiaal met een grote geldwaarde, hoewel er weinig toepassingen bekend zijn. Leer meer over dit zeldzame metaal, ... Lees verder</description></oembed>
