Relative atomic mass: [268]

English: Dubnium
French: Dubnium
Croatian: Dubnij
German: Dubnium
Italian: Dubnio
Spanish: Dubnio

Atomic number: 105
Group numbers: 5
Period: 7
Standard state (20 oC): solid

Discovery: 1967 Albert Ghiorso & Berkely Lab. (US), Georgy Nikolaevich Flerov & JINR Dubna (RU)
Dubnium was discovered by workers at the Nuclear Institute at Dubna (RU) and by workers at the University of California, Berkeley (US) in 1967. The origin of the name dubnium is the Joint Nuclear Institute at Dubna, Russia, an institute heavily involved in the search for heavy elements. It is a synthetic radioactive metal. Dubnium was made by bombarding californium-249 with a beam of nitrogen-15 ions. There are now five known isotopes of dubnium. The longest-lived is dubnium-262, with a half-life of 34 seconds.
Electronic configuration: [Rn] 5f14 6d3 7s2
Formal oxidation number: 
Atomic radius: - pm

Electronegativities: -
Thermal conductivity: - W/(m K)
Electrical resistivity (20 oC): - microOhm cm

Melting point: - oC
Boiling point: - oC

Heat of fusion: - kJ/mol
Heat of vaporization: - kJ/mol
Heat of atomization: - kJ/mol

104Rf <= 105Db => 106Sg

ASCII Periodic Table of the Elements
29 Aug. 2017
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