telluuri
Tellurium (Te, atomic number 52) is a brittle, silvery-white metalloid in the chalcogen family. It occurs in the Earth's crust only in trace amounts and is usually obtained as a byproduct of copper and gold refining. Tellurium compounds are often found in telluride minerals such as calaverite (AuTe2) and sylvanite ((Ag,Au)Te4).
Properties: Tellurium is a relatively rare element with semiconducting properties and photoconductivity. It has a melting
Uses: Elemental tellurium is used in small amounts to improve alloy machinability and to deaerate iron and
History: Tellurium was discovered in 1782 by Franz-Joseph Müller von Reichenstein and was independently described by
Safety: Tellurium and many of its compounds are toxic if ingested or inhaled. Chronic exposure can cause