Search results
Results From The WOW.Com Content Network
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.
Tellurium. Tellurium is a silvery-white, moderately reactive, [8] shiny solid, that has a density of 6.24 g/cm 3 and is soft (MH 2.25) and brittle. It is the softest of the commonly recognised metalloids. Tellurium reacts with boiling water, or when freshly precipitated even at 50 °C, to give the dioxide and hydrogen: Te + 2 H 2 O → TeO 2 ...
Selenium in foods is most commonly found in the form of amino acids such as selenocysteine and selenomethionine. [2] Selenium can protect against heavy metal poisoning. [68] Tellurium is not known to be needed for animal life, although a few fungi can incorporate it in compounds in place of selenium.
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 ...
1. Tomatoes. The high acidity in tomatoes can react strongly with aluminum, causing tiny bits of metal to leach into the food. While this can impart that gross metallic taste, the bigger issue is ...
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.
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]
Selenium trioxide is produced in the laboratory by the reaction of anhydrous potassium selenate (K 2 SeO 4) and sulfur trioxide (SO 3). [25] Salts of selenous acid are called selenites. These include silver selenite (Ag 2 SeO 3) and sodium selenite (Na 2 SeO 3). Hydrogen sulfide reacts with aqueous selenous acid to produce selenium disulfide: