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 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 ...
Selenium is a chemical element; it has the symbol Se and atomic number 34. It has various physical appearances, including a brick-red powder, a vitreous black solid, and a grey metallic-looking form. It has various physical appearances, including a brick-red powder, a vitreous black solid, and a grey metallic-looking form.
Tellurium compounds are chemical compounds of the chemical element tellurium. Subcategories. This category has the following 7 subcategories, out of 7 total. ...
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.
It is prepared by heating tellurium with the appropriate stoichiometry of bromine near 215 °C. The corresponding chloride and iodide, Te 2 Cl and Te 2 I, are also known. [3] Other tellurium bromides include the yellow liquid Te 2 Br 2, the orange solid TeBr 4, [4] and the greenish-black solid TeBr 2. [5]
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 ...
Aluminium telluride is a very air-sensitive [3] dark grey to black solid. [1] It has a band gap of 2.4 eV. [4] The compound decomposes in humid air. [5]In its pure form, it occurs in at least two phases.