Atomic Properties of Db
- Atomic Number of Db
- 105
- Atomic Mass of Db
- 268.0000 u
- Electron Configuration
- [Rn] 5f14 6d3 7s2
- Electronegativity
- —
- Block
- d-block
- Group
- 5
- Period
- 7
Dubnium (Db) is element 105 on the periodic table. Atomic mass of Db: 268.0000 u. Db is in period 7, group 5. Density of Db: 29.30 g/cm³.
Dubnium in everyday life and industry
No biological role possible. Too short-lived for studies. No biological research.
Discovered by A. Ghiorso, et al in United States, 1970
Name origin: Named after the city of Dubna, the site of the JINR.
Also known as Hahnium, Ha. Radioactive transactinide element. Half-life of 1.6s. Discovered in 1970 by Berkeley researchers. So far, seven isotopes have been discovered.
Dubnium has 0 naturally occurring isotopes, plus 1 notable radioactive isotope.
| Isotope | Atomic Mass (u) | Abundance | Half-Life | Decay Mode |
|---|---|---|---|---|
| 268105Db (Db-268)Dubnium-268 isotope | 268.12567 | — | — | — |
Data source: NIH PubChem (aggregated from IUPAC, NIST)
It has no significant commercial applications.
Made by bombarding californium-249 with a beam of nitrogen-15
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