The Element Dubnium
[Click for Isotope Data]
Atomic Number: 105
Atomic Weight: 268
Melting Point: Unknown
Boiling Point: Unknown
Phase at Room Temperature: Solid
Element Classification: Metal
Period Number: 7 Group Number: 5 Group Name: none
Radioactive and Artificially Produced
What's in a name? Named for the Joint Institute for Nuclear Research at Dubna, Russia.
Say what? Dubnium is pronounced as DUB-nee-em.
History and Uses:
Scientists working at the Joint Institute for Nuclear Research in Dubna, Russia, first reported the production of dubnium in 1967. They bombarded atoms of americium-243 with ions of neon-22, forming atoms of dubnium-260 and five free neutrons and atoms of dubnium-261 and four free neutrons. In 1970, a group of scientists working at the Lawrence Radiation Laboratory, now known as the Lawrence Berkeley Laboratory, in Berkeley, California, bombarded atoms of californium-249 with ions of nitrogen-15, forming atoms of dubnium-260 and 4 free neutrons. Credit for the discovery of dubnium is still under debate.
Dubnium's most stable isotope, dubnium-268, has a half-life of about 32 hours and decays through spontaneous fission.
Due to the small amounts produced and its short half-life, there are currently no uses for dubnium outside of basic scientific research.
Estimated Crustal Abundance: Not Applicable
Estimated Oceanic Abundance: Not Applicable
Number of Stable Isotopes: 0 (View all isotope data)
Ionization Energy: Unknown
Oxidation States: Unknown
3s2 3p6 3d10
4s2 4p6 4d10 4f14
5s2 5p6 5d10 5f14
6s2 6p6 6d3