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Title: Chemistry/Elements/Tellurium - It's Elemental: Tellurium Basic physical and historical information.
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Tellurium Data tables and historic information.

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It's Elemental - The Element TelluriumPrivacy and Security NoticeJefferson LabJefferson Lab HomeSearchContact JLabScience Education----------------------Science Education HomeTeacher ResourcesStudent ZoneGames and PuzzlesPrograms and EventsSearch EducationIt's ElementalPrevious ElementPrevious ElementTable of ElementsNext ElementNext Element 52TeTellurium127.60TelluriumAtomic Number:52Atomic Weight:127.60Melting Point:722.66 K (449.51°C or 841.12°F)Boiling Point:1261 K (988°C or 1810°F)Density:6.232 grams per cubic centimeterPhase at Room Temperature:SolidElement Classification:Semi-metalPeriod Number:5Group Number:16Group Name:ChalcogenWhat's in a name?From the Latin word for earth, tellus.Say what?Tellurium is pronounced as te-LOOR-i-em.History and Uses:Tellurium was discovered by Franz Joseph Müller von Reichenstein, a Romanian mining official, in 1782. Reichenstein was the chief inspector of all mines, smelters and saltworks in Transylvania. 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 antinomy. He shortly realized that the metal he had produced wasn't antimony at all, but a previously unknown element. Reichenstein's work was forgotten until 1798 when Martin Heinrich Klaproth, a German chemist, mentioned the substance in a paper. Klaproth named the new element tellurium but gave full credit for its discovery to Reichenstein. Tellurium is found free in nature, but is most often found in the ores sylvanite (AgAuTe4), calaverite (AuTe2) and krennerite (AuTe2). Today, most tellurium is obtained as a byproduct of mining and refining copper.Tellurium is a semiconductor and is frequently doped with copper, tin, gold or silver. Tellurium is also used to color glass and ceramics and is one of the primary ingredients in blasting caps.Tellurium is primarily used as an alloying agent. Small amounts of tellurium are added to copper and stainless steel to make them easier to machine and mill. Tellurium is also added to lead to increase its strength and resistance to sulfuric acid (H2SO4).Tellurium forms many compounds, but none that are commercially important. They include: tellourous acid (H2TeO2), tellurium tetrachloride (TeCl4), tellurium dichloride (TeCl2), tellurium trioxide (TeO3), tellurium monoxide (TeO) and sodium telluride (Na2Te).Estimated Crustal Abundance:1×10-3 milligrams per kilogramEstimated Oceanic Abundance:No Data AvailableNumber of Stable Isotopes:5(View all isotope data)Ionization Energy:9.010 eVOxidation States:+6, +4, -2Electron Shell Configuration:1s22s22p63s23p63d104s24p64d105s25p4This page is maintained by Steve Gagnon.Citation and linking information
 

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