D
Dubnium
Db
Elements
AllChemicals — The Online Chemical Glossary | https://allchemicals.info/chemical/dubnium
Quick Reference
| Formula / Notation | Db |
|---|---|
| Molecular Weight | 268 |
| Category | Elements |
What is Dubnium?
Dubnium is a synthetic radioactive transactinide element named after Dubna, Russia. It is expected to behave similarly to tantalum. First synthesised jointly by Soviet and American teams.
Formula & Notation
Db
Properties & Characteristics
Appearance: unknown. Density: ~29.3 g/cm³ (estimated). Melting point: unknown.
Uses & Applications
No practical applications. Produced for scientific research only.
Safety Information
Highly radioactive. Research hazard only.
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
Dubnium is a synthetic radioactive transactinide element named after Dubna, Russia. It is expected to behave similarly to tantalum. First synthesised jointly by Soviet and American teams.
No practical applications. Produced for scientific research only.
Highly radioactive. Research hazard only.
The formula or notation for Dubnium is: Db
More "D" Terms
D-Orbitals
l=2; 5 orbitals: dxy, dxz, dyz, dx²-y², dz²
D-Transition Elements (Metals)
d-block: [noble gas](n-1)d^(1-10)ns^(0-2)
Darmstadtium
Ds
Daughter Nuclide
Parent → Daughter + radiation; e.g., ²³⁸U → ²³⁴Th + ⁴He
Debye
1 D = 3.336 × 10⁻³⁰ C·m
Degenerate
Degenerate orbitals: same energy level; e.g., 2px = 2py = 2pz
Delocalization
π electrons spread over >2 atoms; resonance
Denaturation
Protein unfolding: ΔG_unfolding < 0 under denaturing conditions
Denatured
Density
ρ = m/V
Deposition
Gas → Solid (no liquid phase): ΔH_dep = −ΔH_sub (exothermic)
Derivative
dC/dt
View all "D" terms →