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Hydrogen telluride is the inorganic compound with the formula H 2 Te.A hydrogen chalcogenide and the simplest hydride of tellurium, it is a colorless gas.Although unstable in ambient air, the gas can exist long enough to be readily detected by the odour of rotting garlic at extremely low concentrations; or by the revolting odour of rotting leeks at somewhat higher concentrations.
Telluric acid, or more accurately orthotelluric acid, is a chemical compound with the formula Te(OH) 6, often written as H 6 TeO 6. It is a white crystalline solid made up of octahedral Te(OH) 6 molecules which persist in aqueous solution. [ 3 ]
The telluride ion is the anion Te 2− and its derivatives. It is analogous to the other chalcogenide anions, the lighter O 2−, S 2−, and Se 2−, and the heavier Po 2−. [1] In principle, Te 2− is formed by the two-e − reduction of tellurium. The redox potential is −1.14 V. [2] Te(s) + 2 e − ↔ Te 2−
This salt is the conjugate base of the thermally unstable acid hydrogen telluride, but it is usually prepared by reduction of tellurium with sodium. Na 2 Te is a challenging material to handle because it is very sensitive to air. Air oxidizes it initially to polytellurides, which have the formula Na 2 Te x (x > 1), and ultimately Te metal.
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Ⓚ Of 103 elements shown in the image, just ten form anions, all of these being in the p-block: arsenic; the five chalcogens: oxygen, sulfur, selenium, tellurium, polonium; and the four halogens: fluorine, chlorine, bromine, and iodine Ⓛ Anion-only elements are confined to oxygen and fluorine.
These are mixed anion compounds, meaning the compounds are cations that contain one or more anions. Some have third anions. Some have third anions. Environmentally, tellurite [TeO 3 ] 2- is the more abundant anion due to tellurate's [TeO 4 ] 2- low solubility limiting its concentration in biospheric waters.
By having more than one anion, many more compounds can be made, and properties tuned to desirable values. [3] In terms of optics, properties include phosphorescence , photocatalysis , [ 4 ] laser damage threshold, refractive index , birefringence , absorption particularly in the ultraviolet or near infrared , non-linearity . [ 5 ]