Dubnium
Element 105 · Transition Metal
Dubnium is the group 5 transactinide, expected to resemble tantalum. Like all superheavy elements it has been made only a few atoms at a time, with its longest-lived isotope surviving about 32 hours. Single-atom experiments suggest its +5 compounds behave much like tantalum's, confirming that periodic trends persist even here. Properties are predicted, with limited experimental data. Dubnium is radioactive; its longest-lived known isotope survives about 32 hours.
Key facts
| Atomic number | 105 |
|---|---|
| Atomic weight | [268] |
| Category | Transition Metal |
| Group / Period | 5 / 7 |
| Block | d |
| Electron configuration | [Rn] 5f14 6d3 7s2 |
| Common oxidation states | +5 (predicted) |
| State at STP | Solid |
Occurrence
Dubnium is entirely synthetic, produced in particle accelerators by nuclear fusion reactions. It has no natural occurrence.
Applications
Single-atom aqueous chemistry experiments
Studies of periodic trends in superheavy elements
No commercial applications
Common compounds
- Dubnium pentachloride (DbCl5, predicted)
- Dubnium(V) oxide (Db2O5, predicted)
Dubnium is named after Dubna, Russia, home of the Joint Institute for Nuclear Research where it was first reported in 1967.
Data source: IUPAC standard atomic weights 2021