It took scientists almost 30 years to agree on a name for this element. They finally chose dubnium, named after the Russian city of Dubná, where the first atoms of this artificial radioactive element were made in 1968. The Joint Institute for Nuclear Research (JINR) is located there. However, a team of U.S. scientists led by Albert Ghiorso also produced samples of the element at the same time. This radioactive element has 12 isotopes, or forms, with different numbers of neutrons.

Summary of properties (Db)

Atomic weight[270]
Discoverer (year)Flerow or Ghiorso (1967)
Natural formmetallic solid (-)
Electron configuration[Rn] 7s2 514 6d3
Melting point (ºC)
Boiling point (ºC)
Abundance in earth's crust (ppm)synthetic
Isotope (abundance)
Density g/cm3
Van der Waals radius (pm)
Covalent radius (pm)149
Electronegativity (Pauling)
Vaporization enthalpy (kJ/mol)-
Enthalpy of fusion (kJ/mol)-
Specific heat capacity (J/g·K) at 25ºC and 1 atm-
Thermal conductivity (W/cm·K) at 25ºC and 1 atm-
Oxidation state
Electron affinity (eV)
1st Ionization potential (eV)

Back to the Periodic Table of the Elements.