124Ubq
-

Ubq

(?)
General properties
Name, symbol, number unbiquadium, Ubq, 124
Pronunciation
Element category superactinide
Group, period, block n/a, 8, g
Standard atomic weight unknown
Electron configuration [Uuo] 6f3 8s2 8p1
(predicted)[1]
2, 8, 18, 32, 32, 21, 8, 3
(predicted)
Physical properties
unknown
Atomic properties
unknown
Oxidation states 6 (predicted)[2]
History
Naming IUPAC systematic element name

Unbiquadium , also known as eka-uranium or element 124, is the temporary name of a hypothetical element in the periodic table that has the temporary symbol Ubq and atomic number 124.

In 2008, a team at GANIL, France, published results indicating that nuclei of unbiquadium had been produced at very high excitation energy, which underwent fission with measurable lifetimes. This result suggests a strong stabilizing effect at Z=124 and points to the next proton shell at Z>120, not at Z=114 as previously thought.

Scientists at GANIL attempted to measure the direct and delayed fission of compound nuclei of elements with Z=114, 120, and 124 in order to probe shell effects in this region and to pinpoint the next spherical proton shell. This is because having complete nuclear shells (or, equivalently, having a magic number of protons or neutrons) would confer more stability on the nuclei of such superheavy elements, thus moving closer to the island of stability. In 2006, with full results published in 2008, the team provided results from a reaction involving the bombardment of a natural germanium target with uranium ions:

$\,^{238}_{92}\mathrm{U} + \,^{nat}_{32}\mathrm{Ge} \to \,^{308,310,311,312,314}\mathrm{Ubq} ^{*} \to \ fission.$

The team reported that they had been able to identify compound nuclei fissioning with half-lives > 10−18 s. A compound nucleus is a loose combination of nucleons that have not arranged themselves into nuclear shells yet.[3] It has no internal structure and is held together for its brief existence only by the forces generated during the collision between the target and projectile nuclei. It is estimated that it requires around 10−14 s for the nucleons to arrange themselves into nuclear shells,[3] at which point the compound nucleus becomes an nuclide, and this number is used by IUPAC[4] as the minimum half-life a claimed isotope must have to potentially be recognised as being discovered. Thus, the GANIL experiments do not count as a discovery of element 124.[3] Although a half-life of just over 10−18 seconds is very short, the ability to measure such decays indicated a strong shell effect at Z=124. A similar phenomenon was found for Z=120 but not for flerovium (Z=114).[5]

## Name

The name unbiquadium is an IUPAC systematic element name, the temporary name and symbol assigned to newly synthesized and not-yet-synthesized chemical elements. A transuranic element receives a permanent name and symbol only after its synthesis has been confirmed. Transuranic elements beyond californium are always artificially produced, and usually end up being named for a scientist or the location of a laboratory that does work in atomic physics.

## References

1. ^ Haire, Richard G. (2006). "Transactinides and the future elements". In Morss; Edelstein, Norman M.; Fuger, Jean. The Chemistry of the Actinide and Transactinide Elements (3rd ed.). Dordrecht, The Netherlands: Springer Science+Business Media. ISBN 1-4020-3555-1.
2. ^ Pyykkö, Pekka (2011). "A suggested periodic table up to Z≤ 172, based on Dirac–Fock calculations on atoms and ions". Physical Chemistry Chemical Physics 13 (1): 161–8. Bibcode:2011PCCP...13..161P. doi:10.1039/c0cp01575j. PMID 20967377.
3. ^ a b c Emsley, John (2011). Nature's Building Blocks: An A-Z Guide to the Elements (New ed.). New York, NY: Oxford University Press. p. 590. ISBN 978-0-19-960563-7.
4. ^ http://science.howstuffworks.com/periodic-table5.htm
5. ^ Morjean, M.; Charvet, J.L.; Chbihi, A.; Chevallier, M.; Cohen, C.; Dauvergne, D.; Dayras, R.; Drouart, A.; Frankland, J.D.; Jacquet, D.; Kirsch,, R.; Laget, M.; Lautesse, P.; L'Hoir, A.; Marchix, A.; Nalpas, L.; Parlog, M.; Ray, C.; Schmitt, C.; Stodel, C.; Tassan-Got, L.; Volant, C. (February 5, 2007). Direct experimental evidence for very long fission times of super-heavy elements. Retrieved January 27, 2013.
Legend
 Alkali metal Alkaline earth metal Super­actinide Eka-​super­actinide Lan­thanide Actinide Transition metal Other metal Metalloid Polyatomic nonmetal Diatomic nonmetal Noble gas predicted predicted predicted predicted predicted predicted predicted predicted predicted predicted