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112 roentgenium ← ununbium → ununtrium Hg ↑ Uub ↓ (Uhb) Periodic Table - Extended Periodic Table
General
Name, Symbol, Number	ununbium, Uub, 112
Chemical series	transition metals
Group, Period, Block	12, 7, d
Appearance	unknown, probably silvery white or metallic gray liquid or colorless gas
Standard atomic weight	(288)  g·mol−1
Electron configuration	perhaps [Rn] 5f14 6d10 7s2 (guess based on mercury)
Electrons per shell	2, 8, 18, 32, 32, 18, 2
Phase	unknown; possibly gas
CAS registry number	54084-26-3
Selected isotopes
Main article: Isotopes of ununbium iso NA half-life DM DE (MeV) DP 283Uub syn ~5 min
References

Ununbium (IPA: /ˌjuːˈnʌnbiəm/), or eka-mercury, is a temporary IUPAC systematic element name for a chemical element in the periodic table that has the temporary symbol Uub and the atomic number 112. Element 112 is one of the superheavy elements. Following periodic trends, one might expect a liquid metal more volatile than mercury. However, some experimental work so far indicates a gas^[1] and theoretical considerations also point to properties more similar to a noble gas than to mercury.^[1][2]

Ununbium was first created on February 9, 1996 at the Gesellschaft für Schwerionenforschung (GSI) in Darmstadt, Germany. This element was created by fusing a zinc atom with a lead atom by accelerating zinc nuclei into a lead target in a heavy ion accelerator.

The element was synthesized in 2000 and 2004 in the Joint Institute for Nuclear Research, Russia.

In May 2006 in the Joint Institute for Nuclear Research the synthesis of this element was confirmed by another method. The isotope ²⁸²Uub was identified as a final product of this series of alpha decays:

²⁹⁴Uuo → ²⁹⁰Uuh → ²⁸⁶Uuq → ²⁸²Uub.

It was found that the final nucleus undergoes spontaneous fission.^[3] Spontaneous fission products are much smaller and irregular.

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Ununbium

• Island of stability

1. ^ ^{a b} Indication for a gaseous element 112.
2. ^ "Chemistry of Hassium". Gesellschaft für Schwerionenforschung mbH (2002). Retrieved on 2007-01-31.
3. ^ Oganessian, Yu. Ts.; Utyonkov, V.K.; Lobanov, Yu.V.; Abdullin, F.Sh.; Polyakov, A.N.; Sagaidak, R.N.; Shirokovsky, I.V.; Tsyganov, Yu.S.; Voinov, Yu.S.; Gulbekian, G.G.; Bogomolov, S.L.; B. N. Gikal, A. N. Mezentsev, S. Iliev; Subbotin, V.G.; Sukhov, A.M.; Subotic, K; Zagrebaev, V.I.; Vostokin, G.K.; Itkis, M. G.; Moody, K.J; Patin, J.B.; Shaughnessy, D.A.; Stoyer, M.A.; Stoyer, N.J.; Wilk, P.A.; Kenneally, J.M.; Landrum, J.H.; Wild, J.H.; and Lougheed, R.W. (2006-10-09). "Synthesis of the isotopes of elements 118 and 116 in the ²⁴⁹Cf and ²⁴⁵Cm+⁴⁸Ca fusion reactions". Physical Review C 74 (4): 044602. DOI:10.1103/PhysRevC.74.044602. Retrieved on 2006-10-16. 

• WebElements.com - Ununbium
• Apsidium - Ununbium