Wednesday, December 19, 2012


Tungsten is a rare metallic element having a bright-gray color. It is extremely hard and dense, has a metallic luster and a very high melting point of 3410ยบ C. Found in wolframite, tungstite and other minerals, it is used in alloys of high speed cutting tools, in special alloys for tanks armor, and electric lamp filaments. Symbol W; valence, 2, 3, 4, 5, and 6; atomic number 74; atomic weight 183.84.