The Element Ununpentium
[Click for Isotope Data]
Atomic Number: 115
Atomic Weight: 289
Melting Point: Unknown
Boiling Point: Unknown
Phase at Room Temperature: Expected to be a Solid
Element Classification: Metal
Period Number: 7 Group Number: 15 Group Name: Pnictogen
Radioactive and Artificially Produced
What's in a name? A temporary name that means one-one-five.
Say what? Ununpentium is pronounced as oon-oon-PENT-ee-em.
History and Uses:
On February 2, 2004, 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 ununpentium. In experiments performed between July 14, 2003 and August 10, 2003, atoms of americium-243 were bombarded with ions of calcium-48 using a device called a cyclotron. This produced one atom of ununpentium-287 and three atoms of ununpentium-288. All four atoms quickly decayed into other elements.
Ununpentium's most stable isotope, ununpentium-289, has a half-life of about 220 milliseconds. It decays into ununtrium-285 through alpha decay.
Since only a few atoms of ununpentium 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