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</html><description>Het is uiterst zeldzaam en wordt niet aangetroffen in de aardmantel, maar het is overvloedig aanwezig in het enorme sterrenbeeld Andromeda. Om deze reden wordt het kunstmatig geproduceerd door de splitsing van twee elementen. Om de samenstelling van Promethium-metaal beter te begrijpen, presenteert dit artikel de belangrijkste concepten die u moet begrijpen. Wat is Promethium? ... Lees verder</description></oembed>
