 |
| 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:
there are no simple chemical tests for hafnium. Zirconium minerals
commonly contain hafnium. Energy Dispersive
Analysis of X-rays (EDAX) is used for qualitative and quantitative analysis.
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