Db
Dubnium
Atomic number: 105Mass: 268 uCategory: Transition Metal
About Dubnium
Dubnium is a synthetic chemical element named after the city of Dubna, Russia, home of the Joint Institute for Nuclear Research. It is a highly radioactive metal. Its most stable isotope has a half-life of about 28 hours.
Properties
Period
7
Group
5
Block
D
Category
Transition Metal
Electronegativity
N/A
Ionization Energy
Unknown
Melting Point
Unknown
Boiling Point
Unknown
Density
29.3 g/cm³
Oxidation States
+5
Electron Configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 6s² 6p⁶ 5f¹⁴ 6d³ 7s²
[Rn] 5f¹⁴ 6d³ 7s²
Shell 1:2e⁻
Shell 2:8e⁻
Shell 3:18e⁻
Shell 4:32e⁻
Shell 5:32e⁻
Shell 6:11e⁻
Shell 7:2e⁻
Real-World Uses
Research only
Nuclear physics
No practical applications
Fundamental science
Scientific studies
Fun Fact
Dubnium is named after Dubna, Russia — there was another Cold War dispute about this element, with the Americans calling it Hahnium instead!