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Another 34 artificial radioisotopes of tungsten have been characterized, the most stable of which are 181 W with a half-life of 121.2 days, 185 W with a half-life of 75.1 days, 188 W with a half-life of 69.4 days, 178 W with a half-life of 21.6 days, and 187 W with a half-life of 23.72 h. [38]
Thirty-four artificial radioisotopes of tungsten have been characterized with mass numbers ranging from 156 to 194, the most stable of which are 181 W with a half-life of 121.2 days, 185 W with a half-life of 75.1 days, 188 W with a half-life of 69.4 days and 178 W with a half-life of 21.6 days.
The elements in the group, like those of groups 7–11, have high melting points, and form volatile compounds in higher oxidation states. All the elements of the group are relatively nonreactive metals with a high melting points (1907 °C, 2477 °C, 3422 °C); that of tungsten is the highest of all metals.
Tungsten was discovered in 1781 by Swedish chemist Carl Wilhelm Scheele. Tungsten has the highest melting point of all metals, at 3,410 °C (6,170 °F). Filament of a 200 watt incandescent lightbulb highly magnified. Up to 22% Rhenium is alloyed with tungsten to improve its high temperature strength and corrosion resistance.
Tungsten hexachloride is an inorganic chemical compound of tungsten and chlorine with the chemical formula W Cl 6. This dark violet-blue compound exists as volatile crystals under standard conditions. It is an important starting reagent in the preparation of tungsten compounds. [1]
Tungsten(VI) oxide, also known as tungsten trioxide is a chemical compound of oxygen and the transition metal tungsten, with formula WO 3. The compound is also called tungstic anhydride , reflecting its relation to tungstic acid H 2 WO 4 .
The chemical elements can be broadly divided into metals, metalloids, and nonmetals according to their shared physical and chemical properties.All elemental metals have a shiny appearance (at least when freshly polished); are good conductors of heat and electricity; form alloys with other metallic elements; and have at least one basic oxide.
Tungsten diselenide is an inorganic compound with the formula WSe 2. [6] The compound adopts a hexagonal crystalline structure similar to molybdenum disulfide . The tungsten atoms are covalently bonded to six selenium ligands in a trigonal prismatic coordination sphere while each selenium is bonded to three tungsten atoms in a pyramidal geometry.