Tungsten

       

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  Tungsten
  

  
  

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  W is the symbol for wolfram (tungsten), which is a chemical element in group VIB of the periodic table. Its atomic number is 74 and its density is 19.35 g/cm³. Its melting point and boiling point are respectively 3410.0 ℃ (3683.15 K, 6170.0 °F) and 5660.0 ℃ (5933.15 K, 10220.0 °F). Pure tungsten is a light gray or whitish metal, which is a solid at room temperature. Tungsten doesn't occur in its pure metallic state in nature, rather it exists in several ores, but only wolframite and scheelite are mined commercially. Of all metals in pure form, tungsten has the highest melting point, the highest tensile strength and the lowest vapor pressure. It has excellent corrosion resistance and the bulk metal resists attack by oxygen, acids and alkalis. Tungsten is widely used in the production of hard materials, alloys, filaments, electrodes, industrial catalysts, etc.
  

  
  

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