2012年5月10日星期四

Discovery of Tungsten


In 1779 Peter Woulfe deduced the existence of a new element - Tungsten - from his analysis of the mineral wolframite (an iron manganese tungstate mineral). 

Tungsten was isolated as tungstic oxide (WO3) in 1781 by Carl W. Scheele from the mineral scheelite (calcium tungstate). However he did not have a suitable furnace to reduce the oxide to the metal. 

Tungsten was finally isolated by Fausto and Juan Jose de Elhuyar in 1783 by reduction acidified wolframite with charcoal. 

The element name comes from the Swedish words 'tungsten', meaning heavy stone.
The chemical symbol, W, comes from the original name of the element, Wolfram.

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