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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.
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 compounds are chemical compounds of 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
Tellurium dioxide (TeO 2) is a solid oxide of tellurium. It is encountered in two different forms, the yellow orthorhombic mineral tellurite, β-TeO 2, and the synthetic, colourless tetragonal (paratellurite), α-TeO 2. [2] Most of the information regarding reaction chemistry has been obtained in studies involving paratellurite, α-TeO 2. [3]
However, tellurium is a relatively rare element (1–5 parts per billion in the Earth's crust; see Abundances of the elements (data page)). Through improved material efficiency and increased PV recycling systems, the CdTe PV industry has the potential to fully rely on tellurium from recycled end-of-life modules by 2038. [17]
Organotellurium chemistry describes the synthesis and properties of organotellurium compounds, chemical compounds containing a carbon-tellurium chemical bond. Organotellurium chemistry is a lightly studied area, in part because of it having few applications. [1] [2]
Tellurium has properties similar to sulfur and selenium. In the anhydrous form Na 2 TeO 3 the tellurium atoms are 6 coordinate, three Te-O at 1.87 Å and three at 2.9 Å, with distorted octahedra sharing edges. [2] In the pentahydrate, Na 2 TeO 3.5H 2 O there are discrete tellurite anions, TeO 3 2− which are pyramidal.
The shape of the telluropyrylium molecule is not a perfect hexagon, as the bond lengths to the tellurium atom at about 2.068 Å compared to about 1.4 Å for the carbon-carbon bonds. The angle at the tellurium atom is also reduced to about 94°, angles at the α and γ carbon atoms in the ring are about 122° and at the β positions 129°.