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Element (W) with atomic number 74, atomic weight 183.85, belonging to the third series of transition elements. Gray metal, density 19.3, melting point 3410 C (the highest of all metals) and boiling 5660 C.
Tungsten alloys to date from the late nineteenth century. The tungsten vita lite filaments were introduced by Auer and Coolidge. The evaporation of tungsten, which plays an important role, in particular in halogen lamps, has been studied by Langmuir. The tungsten carbide tools dating from 1920.
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