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Dubnium

Metal radioactivesynthetic
Symbol: Db
Atomic number: 105
Atomic mass: (262.1144)
Group: Transition Metal
CAS-number: 53850-35-4

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Physical data
Isotopes
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Physical data

Electronic dataThermal dataSteric data
Shells: 2, 8, 18, 32, 32, 11, 2
Orbitals: [Rn] 5f14 6d3 7s2
Electronegativity: --, --
1. Ionization potential: -- eV
2. Ionization potential: -- eV
3. Ionization potential: -- eV
Oxidation states: --
Electrical conductivity: --
Melting point: -- °C
Boiling point: -- °C
Specific heat: -- J/gK
Heat of fusion: -- kJ/mol
Heat of vaporization: -- kJ/mol
Thermal conductivity: 0.58 W/cmK
Atomic radius: -- Å
Ionic radius: -- Å
Covalent radius: -- Å
Atomic volume: -- cm³/mol
Density (293 K): -- g/cm³
Crystal structure: --

Isotopes

NuclideAbundance [%]MassSpinHalflifeDecay modeDecay tree
258Db 0 258.109 0 4.2s α, EC View
262Db 0 262.114 0 34s SF, α View

Other info

Name origin:--
Description:Synthetic radioactive metal.
Discovered by:A. Ghiorso, et al
Year:1970
Place:United States
Sources:Made by bombarding californium-249 with a beam of nitrogen-15
Use(s):It has no significant commercial applications.