Since its discovery, searches for the element technetium in terrestrial materials have been made without success.
Technetium is a silvery-grey metal that tarnishes slowly in moist air.
Until 1960, technetium was available only in small amounts. The chemistry of technetium is related to that of rhenium. Both values are quoted on the Pauling scale. The following CrystalMaker image represents the solid state structure. For most elements, the most stable allotrope is illustrated.