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Tungsten (also called wolfram) [14] [15] is a chemical element; it has symbol W and atomic number 74. It is a rare metal found naturally on Earth almost exclusively as compounds with other elements. It was identified as a distinct element in 1781 and first isolated as a metal in 1783.
Another catalytic use of tungsten is as a De-NO X catalyst which is used in the treatment of nitrogen oxide emissions to convert harmful nitrogen oxides into inert N 2 gas. [14] Another modern day use of tungsten is as a lubricant. Tungsten disulfide (WS 2) is a lubricant with a dynamic coefficient of friction of ~0.03. Tungsten disulfide can ...
Group 6, numbered by IUPAC style, is a group of elements in the periodic table.Its members are chromium (Cr), molybdenum (Mo), tungsten (W), and seaborgium (Sg). These are all transition metals and chromium, molybdenum and tungsten are refractory metals.
"Wolfram" is an alternate name for tungsten, a strategic material used in anti-tank weapons and machine tools. Most of the wolframite mines in Europe, such as the Barruecopardo mine, are in northwestern Spain and northern Portugal. [a] The high demand for this scarce strategic mineral in war time had created a bubble in prices, with the ...
Scheelite was first described in 1751 for an occurrence in Mount Bispbergs klack, Säter, Dalarna, Sweden, and named for Carl Wilhelm Scheele (1742–1786). [3] Owing to its unusual heaviness, it had been given the name tungsten by the Swedes, meaning “heavy stone.” The name was later used to describe the metal, while the ore itself was ...
The first sentence of the Chemical Properties seems to need a home or some other sentences around it to keep it company. "Tungsten resists attack by oxygen, acids, and alkalis." The first sentence of the Biological role also seems to be hanging. Why not combine it with the next sentence without a break. The tungsten (VI) oxide link doesn't work.
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. It is a light yellow crystalline solid. [1]
Tungsten, 74 W; Tungsten ... "W": from Wolfram, ... These are called theoretical elements. They can have article and other content pages though. Incidentally, this ...