Tellurium
From Tardis Wiki, the free Doctor Who reference
Tellurium was one of the exceptional chemical elements in the periodic table. Its atomic weight was 128, its atomic number was 52, (PROSE: The Krotons) and it was soluble in sulphuric acid.
The atmosphere of the Gonds' planet had hydrogen telluride.
The Krotons had a life system based on tellurium, and their Dynatrope machine ships were composed of 80% tellurium. (TV: The Krotons)
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