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Thorium
Symbool: Th
Atoomnummer: 90

Thorium is een element, nummer 90 in het Periodiek systeem en onderdeel van de actinide groep.

Afkomstig van Memory Alpha, de Vrije Star Trek Encyclopedie. "http://nl.memory-alpha.wikia.com/wiki/Thorium?oldid=94684"

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