 |
| 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.
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