Ununquadium



114 ununpentium
Pb
↑
Uuq
↓
(Uhq)
General
Number ununquadium, Uuq, 114
poor metals
Block p
Appearance unknown, probably silvery
white or metallic gray
Standard atomic weight (298)  g·mol−1
lead)
shell 2, 8, 18, 32, 32, 18, 4
Phase presumably a solid
CAS registry number 54085-16-4
Selected isotopes
Main article: Isotopes of ununquadium
iso NA half-life DM DE (MeV) DP
288Uuq syn 2.8 s
References

Ununquadium (atomic number 114.

Contents

History

The discovery of ununquadium in December 1998 was reported in January 1999 by scientists at Dubna (Joint Institute for Nuclear Research) in Russia.[1] The same team produced another isotope of Uuq three months later[2] and confirmed the synthesis in 2004 and 2006.

In 2004 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).

Ununquadium is a temporary IUPAC lead. It is expected to be a soft, dense metal that tarnishes in air, with a melting point around 200 degrees Celsius.

Synthesis

Ununquadium can be synthesized by bombarding calcium-48 heavy ion beams, such as in

\,^{242}_{94}\mathrm{Pu} + \,^{48}_{20}\mathrm{Ca} \, \to \,^{287}_{114}\mathrm{Uuq} + 3 \; ^1_0\mathrm{n} \;

\,^{244}_{94}\mathrm{Pu} + \,^{48}_{20}\mathrm{Ca} \, \to \,^{289}_{114}\mathrm{Uuq} + 3 \; ^1_0\mathrm{n} \;

In search for the island of stability - ununquadium-298

According to the ununtrium. So far, all three that have been made have undergone spontaneous fission in the first .0012 milliseconds, and therefore have never been able to be studied.

Difficulty in synthesis

Manufacturing ununquadium-298 would be very difficult, because nuclei summing to 114 protons and 184 neutrons are not available in weighable quantities.

However it may be possible to generate ununquadium-298, if nuclear transfer reactions can be achieved.[citation needed] One of these reactions may be

\,^{204}_{80}\mathrm{Hg} + \,^{136}_{54}\mathrm{Xe} \, \to \,^{298}_{114}\mathrm{Uuq} + \,^{40}_{20}\mathrm{Ca} + 2 \; ^1_0\mathrm{n} \;

See also

References

  1. ^ Oganessian, Yu. Ts.; et al. (October 1999). "Synthesis of Superheavy Nuclei in the 48Ca + 244Pu Reaction". Physical Review Letters 83: 3154. doi:10.1103/PhysRevLett.83.3154.
  2. ^ Oganessian; et al. (July 1999). "Synthesis of nuclei of the superheavy element 114 in reactions induced by 48Ca". Nature 400: 242. doi:10.1038/22281.
  • Report in Science
 
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