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Tellurium is a chemical element; it has 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 its native form as elemental crystals.
Minerals containing the chemical element tellurium Note (New Dana Classification): Telluride minerals are in the category: Sulfides and Sulfosalts (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.) too
There are 39 known isotopes and 17 nuclear isomers of tellurium (52 Te), with atomic masses that range from 104 to 142. These are listed in the table below. Naturally-occurring tellurium on Earth consists of eight isotopes. Two of these have been found to be radioactive: 128 Te and 130 Te undergo double beta decay with half-lives of, respectively, 2.2×10 24 (2.2 septillion) years (the longest ...
Tellurium compounds are compounds containing the element tellurium (Te). Tellurium belongs to the chalcogen (group 16) family of elements on the periodic table, which also includes oxygen, sulfur, selenium and polonium: Tellurium and selenium compounds are similar. Tellurium exhibits the oxidation states −2, +2, +4 and +6, with +4 being most ...
The main source of tellurium is from copper anode slimes, which contain precious metals as well as various tellurides. These slimes are roasted with sodium carbonate and oxygen to produce sodium tellurite. [1] Ag 2 Te + Na 2 CO 3 + O 2 → 2Ag + Na 2 TeO 3 + CO 2 (400–500 °C) This is a reaction with silver telluride.
Tellurite is a rare oxide mineral composed of tellurium dioxide (Te O 2).. It occurs as prismatic to acicular transparent yellow to white orthorhombic crystals. It occurs in the oxidation zone of mineral deposits in association with native tellurium, emmonsite and other tellurium minerals.
Tellurium is a semiconductor with an electrical conductivity of around 1.0 S•cm −1 [388] and a band gap of 0.32 to 0.38 eV. [389] Liquid tellurium is a semiconductor, with an electrical conductivity, on melting, of around 1.9 × 10 3 S•cm −1. [389] Superheated liquid tellurium is a metallic conductor. [390]
The half-life of 115 In is very long because the beta decay to 115 Sn is spin-forbidden. [36] Indium-115 makes up 95.7% of all indium. Indium is one of three known elements (the others being tellurium and rhenium ) of which the stable isotope is less abundant in nature than the long-lived primordial radioisotopes.