Ununpentium



115 ununhexium
Bi
↑
Uup
↓
(Uhp)
General
Number ununpentium, Uup, 115
Block p
Standard atomic weight (299)  g·mol−1
bismuth)
shell 2, 8, 18, 32, 32, 18, 5
CAS registry number 54085-64-2
Selected isotopes
Main article: Isotopes of ununpentium
iso NA half-life DM DE (MeV) DP
288Uup syn 87 ms
References

Ununpentium (bismuth.

Element 115 also falls in the center of the theoretical magic number" of 184 neutrons, which would be Uup-299. The currently fabricated isotopes only had at most 173 neutrons (Uup-288).

History

On February 2, 2004, ununtrium were reported in Physical Review C by a team composed of Russian scientists at Dubna University's Joint Institute for Nuclear Research and American scientists at the Lawrence Livermore National Laboratory.[1][2]

The team reported that they bombarded ununtrium (element 113) in approximately 100 milliseconds. The ununtrium produced then existed for 1.2 seconds before decaying into natural elements.

The synthesizing of the element was also reported by scientists of Japan.

In May 2006 in the Joint Institute for Nuclear Research the synthesis of this element was confirmed by another method (the chemical identifying on final products of decay of element).

Ununpentium is a temporary IUPAC systematic element name. Element 115 is also sometimes called eka-bismuth.

Chemical properties

For now element 115 has only been manufactured in the amount of a few atoms, so the chemistry of element 115 has yet to be researched, but chemistry and physics can tell us a lot about what to expect. Although element 115 is in the same group as element 112, which seems to confirm relativistic effects for superheavy elements.

In popular culture

Ununpentium has been theorized to be inside the island of stability. This probably explains why it was mentioned regularly in popular culture, especially in UFO conspiracy theories. The most popular account of element 115, from Bob Lazar, would require changes to a great many existing theories.[4]

See also

References

  1. ^ Oganessian, Yu. Ts.; et al. (2004). "Experiments on the synthesis of element 115 in the reaction 243Am(48Ca,xn)291−x115". Physical Review C 69: 021601. doi:10.1103/PhysRevC.69.021601.
  2. ^ Oganessian, Yu. Ts.; et al. (2005). "Synthesis of elements 115 and 113 in the reaction 243Am + 48Ca". Physical Review C 72: 034611. doi:10.1103/PhysRevC.72.034611.
  3. ^ Keller, O. L., Jr.; C. W. Nestor, Jr. (1974). "Predicted properties of the superheavy elements. III. Element 115, Eka-bismuth". Journal of Physical Chemistry 78: 1945. doi:10.1021/j100612a015.
  4. ^ David L. Morgan (August 26, 1996, revised October 2005). Lazar Critique. Retrieved on 2007-08-18.
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Ununpentium". A list of authors is available in Wikipedia.