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tungsten
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tungsten

Hard, heavy, grey-white, metallic element, atomic number 74, relative atomic mass 183.85. Its chemical symbol comes from the German Wolfram. It occurs in the minerals wolframite, scheelite, and hubertite. It has the highest melting point of any metal (3,410°C/6,170°F) and is added to steel to make it harder, stronger, and more elastic; its other uses include high-speed cutting tools, electrical elements, and thermionic couplings. Its salts are used in the paint and tanning industries.

Tungsten was first recognized in 1781 by Swedish chemist Karl Scheele in the ore scheelite. It was isolated in 1783 by Spanish chemists Fausto D'Elhuyar (1755–1833) and his brother Juan José (1754–1796).

In 1999, the US Army started issuing soldiers with environmentally friendly bullets that are composed of tungsten, which does not pollute the soil, unlike lead that had traditionally been used in bullets.
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We suggested that our results support the advisability for further consideration of tungsten compounds or synergistic effects of tungsten with other environmental factors in cases such as Fallon.
Tungsten alloy and cancer in rats: Kalinich responds by Kalinich, John F. / Environmental Health Perspectives
Based on a small number of studies, prevailing theory is that elemental tungsten or insoluble tungsten compounds have only limited toxicity (Leggett 1997).
Embedded weapons-grade tungsten alloy shrapnel rapidly induces ... by McClain, David E. / Environmental Health Perspectives
 
 
 
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