Dubnium (Db)
Dubnium (Db) is element 105, a transition metal. Atomic mass 268, configuration [Rn] 5f¹⁴ 6d³ 7s². Properties, isotopes, oxidation states, uses and history, with an interactive 3D atom model.
Key facts
| Atomic number | 105 |
|---|---|
| Symbol | Db |
| Standard atomic weight | 268 |
| Category | Transition Metal |
| Group | 5 |
| Period | 7 |
| Electron configuration | [Rn] 5f¹⁴ 6d³ 7s² |
| Valence electrons | 2 (Variable) |
| Common ions | No common ions |
| First ionization energy | 665 kJ/mol |
Common uses
- Research only
Where it matters
- International cooperation (IUPAC naming resolution)
Hazards
- Radioactive
History
| Discovered | 1968 |
|---|---|
| Discovered by | Dubna (USSR) / Berkeley (USA) |
| Name | Dubna, Russia |