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Tungsten, also known as wolfram, is a chemical element with symbol W and atomic number 74.  Based on its purity, the colour of tungsten may range from white for the pure metal to steel-grey for the metal with impurities. It is commercially available in a powdered or solid form. The melting point of tungsten is the highest among metals and it resists corrosion. It is a good conductor of electricity and acts as a catalyst in chemical reactions. Tungsten in the form of finely divided powder is highly flammable and may ignite spontaneously on contact with air. Powdered tungsten may also cause fire or explosion on contact with oxidants.