Tungsten
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Tungsten is a chemical element, having the chemical symbol W. Its atomic number (the number of protons) is 74. It has a standard atomic weight of 183.5 g•mol −1 and is a solid in its elemental form.
Tungsten is considered a member of the "Transition metal" class of elements. At a pressure of 101.325 kPa, it has a boiling point of 5,555 °C and a melting point of 3,422 °C. With a density of 19.3 g/cc, it is 1.7 times denser than lead.
Because of its very high melting point, tungsten filaments were used for many years in incandescent light bulbs.