tungsten

Name tungsten
Symbol W
Atomic Weight 183.84
Atomic Number 74
CAS ID 7440-33-7
Group Number 6
Group Name (none)
Period Number 6
Origin of Name Swedish, tung sten = "heavy stone."
Year Discovered 1783
Discovery Credits Isolated by J. J. and F. Elhuijar at Vergara, Spain.
Class Metallic
Color Grayish White, Lustrous
Standard State Solid at 77 F & 298 K
Description Obtained as dull gray powder, difficult to melt. Metal is lustrous and silvery white. Resists attack by oxygen, acids, and alkalis. Used in alloys, light bulb filaments, and cutting tools.

Diagnostic tests: 
Wolframates (Tungstates )(WO42-): When the mineral is decomposed by boiling in HCL, the insoluble WO3 canary yellow oxide is obtained.
Tungsten gives a Na2(NH4)(PO4) bead a clear (no) color in the oxidizing flame and a fine blue color in the reducing flame.

Back to Elements Table Page