Tellurium

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)