Tellurium

tellurium (Te), semimetallic chemical element in the oxygen group (Group 16 [VIa] of the periodic table), closely allied with the element selenium in chemical and physical properties. Tellurium is a silvery white element with properties intermediate between those of metals and nonmetals; it makes up approximately one part per billion of Earth’s crust. Like selenium, it is less often found uncombined than as compounds of metals such as copper, lead, silver, or gold and is obtained chiefly as a by-product of the refining of copper or lead. No large use for tellurium has been found.