| Hafnium [Hf] (CAS-ID: 7440-58-6) | |
| An: 72 N: 106 Am: 178.49 | |
| Group No: 4 Group Name: (none) | |
| Block: d-block Period: 6 | |
| State: solid at 298 K | |
| Colour: grey steel Classification: Metallic | |
| Boiling Point: unknown (?) | |
| Melting Point: unknown (?) | |
| Density: 13.31g/cm3 | |
 Discovery Information |
| Who: Dirk Coster , George Hevesy |
| When: 1923 |
| Where: Denmark |
| Name Origin |
| From Hafnia, the Latin name of Copenhagen. |
| Sources |
| Hafnium does not exist in nature in elemental form. Obtained from mineral zircon. |
| Uses |
| Used in gas-filled and incandescent lamps, reactor control rods because of its ability to absorb neutrons also as a gas scavenger in vacuum tubes. |
| Notes |
| A man made radioactive element and the first transactinide element. |
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