| Name | hafnium |
|---|---|
| Symbol | Hf |
| Atomic Weight | 178.49 |
| Atomic Number | 72 |
| CAS ID | 7440-58-6 |
| Group Number | 4 |
| Group Name | (none) |
| Period Number | 6 |
| Origin of Name | Latin, Hafnia = "Copenhagen." |
| Year Discovered | 1923 |
| Discovery Credits | Discovered by D. Coster and G. C. von Hevesey at Copenhagen, Denmark. |
| Class | Metallic |
| Color | Grey Silvery |
| Standard State | Solid at 77 F & 298 K |
| Description | Lustrous, silvery, ductile metal. Resists corrosion due to
oxide film, but powdered Hf will burn in air. Unaffected by acids (except
HF) and alkalis. Used in control rods for nuclear reactors; high
temperature alloys and ceramics. Diagnostic tests: |