Dubnium

General:

Name:Dubnium Symbol:Db
Type:Transition Metal Atomic weight:262
Density @ 293 K:g/cm3 Atomic volume:cm3/mol
Discovered:

Credit for the discovery of dubinium in 1967 is shared between teams of scientists at the Joint Institute for Nuclear Research at Dubna, Russia and scientists at Lawrence Berkeley National Laboratory, California. The element was named after the research facility in Russia where it was synthesized.

States

State (s, l, g):solid
Melting point:K (°C) Boiling point:K ( °C)

Energies

Specific heat capacity:J g-1 K-1 Heat of atomization: kJ mol-1
Heat of fusion: kJ mol-1 Heat of vaporization : kJ mol-1
1st ionization energy: kJ mol-1 2nd ionization energy: kJ mol-1
3rd ionization energy: kJ mol-1 Electron affinity: kJ mol-1

Oxidation & Electrons

Shells:2,8,18,32,32,11,2 Electron configuration:[Rn] 5f14 6d3 7s2
Minimum oxidation number: Maximum oxidation number:
Min. common oxidation no.: Max. common oxidation no.:
Electronegativity (Pauling Scale): Polarizability volume:Å3

Appearance & Characteristics

Structure: Color:
Hardness:mohs
Harmful effects:

Dubnium is harmful due to its radioactivity.

Characteristics:

Dubnium is a radioactive synthetic metal and has only been produced in tiny amounts.


Uses:

Dubnium is of research interest only.

Reactions

Reaction with air: Reaction with 6 M HCl:
Reaction with 15 M HNO3: Reaction with 6 M NaOH:

Compounds

Oxide(s): Chloride(s):
Hydride(s):

Radius

Atomic radius:pm Ionic radius (1+ ion):pm
Ionic radius (2+ ion):pm Ionic radius (3+ ion):pm
Ionic radius (2- ion):pm Ionic radius (1- ion):pm

Conductivity

Thermal conductivity:W m-1 K-1 Electrical conductivity: x 106 S cm-1

Abundance & Isotopes

Abundance earth's crust:nil
Abundance solar system:parts per billion by weight, part per billion by moles
Cost, pure: $ per 100g
Cost, bulk: $ per 100g
Source:

Dubnium is a synthetic radioactive metal, created by nuclear bombardment, and has only been produced in tiny amounts. Dubnium is made by bombarding californium-249 with nitrogen. It can also be produced by bombarding americium-243 with neon.

Isotopes:

Dubnium has 8 isotopes whose half-lives are known, with mass numbers from 255 to 263. None are stable. The most stable isotope is 262Db, with a half-life of 34 seconds.

Other

Other: