Tellurium is a chemical element with the symbol Te and atomic number 52. It is a brittle, mildly toxic, rare, silver-white metalloid. Tellurium is chemically related to selenium and sulfur, all three of which are chalcogens. It is occasionally found in native form as elemental crystals. Tellurium is far more common in the Universe as a whole than on Earth. Its extreme rarity in the Earth's crust, comparable to that of platinum, is due partly to its formation of a volatile hydride that caused tellurium to be lost to space as a gas during the hot nebular formation of Earth.[7] Tellurium-bearing compounds were first discovered in 1782 in a gold mine in Kleinschlatten, Transylvania (now Zlatna, Romania) by Austrian mineralogist Franz-Joseph Müller von Reichenstein, although it was Martin Heinrich Klaproth who named the new element in 1798 after the Latin tellus 'earth'. Gold telluride minerals are the most notable natural gold compounds. However, they are not a commercially significant source of tellurium itself, which is normally extracted as a by-product of copper and lead production. Commercially, the primary use of tellurium is copper (tellurium copper) and steel alloys, where it improves machinability. Applications in CdTe solar panels and cadmium telluride semiconductors also consume a considerable portion of tellurium production. Tellurium is considered a technology-critical element. Tellurium has no biological function, although fungi can use it in place of sulfur and selenium in amino acids such as tellurocysteine and telluromethionine.[8] In humans, tellurium is partly metabolized into dimethyl telluride, (CH3)2Te, a gas with a garlic-like odor exhaled in the breath of victims of tellurium exposure or poisoning.
Elven gymyk yw teloriom, niver 52 y'n Vosen Beriodek. Y furvell gymyk yw Te. An hanow a dheu dhyworth an ger tellus, hanow Latin rag an Norvys. Nyns eus rann y'n korf denel dhe deloriom. Nyns yw gwenonek, mes ev a wra kawsya drog anal ha fler korf (henwys yn Sowsnek tellurium breath). Diskudhys veu yn 1783 gans Franz-Joseph Müller von Reichenstein (1740-1825) yn Sibiu, Romani, mes henwys veu gans Martin Klaproth (1743-1817), kymygydh almaynek. Kevys yw avel alkan yn naturel, mes pur danow yw henna. Tanow yw monow teloriom maga ta, kepar ha calaverit (AuTe2), sylvanit (AgAuTe4) ha tellurit (TeO2), mes nyns yns usys avel pennfenten an elven. Askorrys yw 110 tonnas a'n alkan an vledhen, avel isaskorr purhe kober. Hanter-alkan yw teloriom, ha kevys yw herwydh usadow avel polter loos. Gorrys yw yn kesalkenyow gans kober ha dur dinam dhe wellhe es y dhyghtyans, ha dhe {{Plobm|blomm]] (0.05%) dh'y grevhe. Usys yw ynwedh gans kadmiom yn panellow howlek ha hanter-kendegoryon y'n diwysyans elektronek. Poos atomek teloriom yw 127.60, y boynt teudhi yw 450°C ha'y boynt bryjyon yw 990°C. Y dhosedh yw 6.2kg an liter. Hanter-alkan gwynn-arghansek lentrus yw teloriom mes kavadow yw ynwedh avel polter loos tewl.langbot langbot