Tellurium belongs to chalcogen (oxygen family). Tellurium atomic number is 52 and atomic mass is about 127.60 g/mol. It has high melting point about 449.51 C and boiling point is 988 C. They include: tellourous acid (H 2TeO 2), tellurium tetrachloride (TeCl 4), tellurium dichloride (TeCl 2), tellurium trioxide (TeO 3), tellurium monoxide (TeO) and sodium telluride (Na 2Te). In molten form, tellurium is corrosive to copper, iron and stainless steel. Tellurium forms many compounds, but none that are commercially important. Tellurium is also added to lead to increase its strength and resistance to sulfuric acid (H 2SO 4). Using their proxies, the researchers calculated that 18 gold mines in the two countries could produce 90 tons/year of tellurium from current mining, with another six copper, zinc, and nickel. Small amounts of tellurium are added to copper and stainless steel to make them easier to machine and mill. Tellurium is primarily used as an alloying agent. Tellurium is also used to color glass and ceramics and is one of the primary ingredients in blasting caps. Tellurium is a semiconductor and is frequently doped with copper, tin, gold or silver. Today, most tellurium is obtained as a byproduct of mining and refining copper. Tellurium is found free in nature, but is most often found in the ores sylvanite (AgAuTe 4), calaverite (AuTe 2) and krennerite (AuTe 2). Klaproth named the new element tellurium but gave full credit for its discovery to Reichenstein. Reichenstein's work was forgotten until 1798 when Martin Heinrich Klaproth, a German chemist, mentioned the substance in a paper. Considered the best machining of the high-Copper Alloys, this Copper-Tellurium Alloy acquires strength from Alloying Tellurium. He shortly realized that the metal he had produced wasn't antimony at all, but a previously unknown element. He also had an interest in chemistry and extracted a new metal from an ore of gold, known as aurum album, which he believed was antimony. Reichenstein was the chief inspector of all mines, smelters and saltworks in Transylvania. Tellurium was discovered by Franz Joseph Müller von Reichenstein, a Romanian mining official, in 1782.
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