tungsten
Sign in to saveTungsten (also called wolfram) is a chemical element which has the symbol W (from ) and atomic number 74. It is a metal found naturally on Earth almost exclusively in compounds with other elements. It was identified as a distinct element in 1781 and first isolated as a metal in 1783. Its important ores include scheelite and wolframite, the latter lending the element its alternative name.
AI overview
Tungsten is a naturally occurring metal (chemical symbol W) that was first discovered as a distinct element in 1781 and isolated as pure metal two years later. It's important because it has useful properties as a metal and is extracted from natural ore deposits like scheelite and wolframite.
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Article
28 sectionsContents
- Characteristics
- Physical properties
- Isotopes
- Chemical properties
- History
- Etymology
- Occurrence
- Chemical compounds
- Production
- Reserves
- Extraction
- Applications
- Industrial
- Alloys
- Permanent magnets
- Military
- Chemical applications
- Niche uses
- Gold substitution
- Electronics
- Nanowires
- Fusion power
- Biological role
- In archaea
- Health factors
- See also
- References
- External links
Tungsten (also called wolfram) is a chemical element which has the symbol W (from ) and atomic number 74. It is a metal found naturally on Earth almost exclusively in compounds with other elements. It was identified as a distinct element in 1781 and first isolated as a metal in 1783. Its important ores include scheelite and wolframite, the latter lending the element its alternative name.
The free element is remarkable for its robustness, especially the fact that it has the highest melting point of all known elements, at . It also has the highest boiling point, at . Its density is 19.254 g/cm3, comparable with that of uranium and gold, and much higher (about 1.7 times) than that of lead. Polycrystalline tungsten is an intrinsically brittle and hard material (under standard conditions, when uncombined), making it difficult to work into metal. However, pure single-crystalline tungsten is more ductile and can be cut with a hard-steel hacksaw.