The Element Ununseptium
[Click for Isotope Data]
Atomic Number: 117
Atomic Weight: 294
Melting Point: Unknown
Boiling Point: Unknown
Phase at Room Temperature: Expected to be a Solid
Element Classification: Unknown
Period Number: 7 Group Number: 17 Group Name: Halogen
Radioactive and Artificially Produced
What's in a name? A temporary name that means one-one-seven.
Say what? Ununseptium is pronounced as oon-oon-SEPT-ee-em.
History and Uses:
On April 5, 2010, scientists working at the Joint Institute for Nuclear Research in Dubna, Russia, along with scientists from the U.S. Department of Energy's Lawrence Livermore National Laboratory, announced the creation of ununseptium. They produced ununseptium by bombarding atoms of berkelium-249 with ions of calcium-48.
Ununseptium's most stable isotope, ununseptium-294, has a half-life of about 80 milliseconds. It decays into ununpentium-290 through alpha decay.
Since only a few atoms of ununseptium have ever been produced, it currently has no uses 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 6d10