Tungsten’s element symbol W was derived from an old name of the ore, Wolframite. However, it was called tungsten (Swedish for "heavy stone") in English. The name Wolfram was dropped in 2005, to make the periodic table standard. This is probably one of the most highly disputed name changes in the periodic table. It may develop a rainbow oxide when exposed to air. It is the 4th hardest element after carbon, boron, and chromium. Tungsten is one of five refractory metals, meaning it exhibits high resistance to heat and wear. It is the heaviest element used in biochemical reactions; certain bacteria use it in an enzyme. Natural tungsten consists of five stable isotopes with radioactive decay half-life of four quintillion years. The military uses tungsten to make bullets and missiles used in “kinetic bombardment”, which uses a dense material to breach armour instead of explosives. Tungsten has been found in counterfeit gold bricks, because its density is similar to that of gold. The ball in the Ballpoint pen is usually made of Tungsten.
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