The Ununhexium reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Ununhexium

Ununpentium - Ununhexium - Ununseptium Po Uuh         Full table
Predicted properties
Name, Symbol, Number	Ununhexium, Uuh, 116
Chemical series	Presumably poor metals
Group, Period, Block	16, 7 , p
Appearance	Unknown, probably a metallic and silvery white or grey colour
Atomic weight	[292] amu
Electron configuration	[Rn] 5f14 6d10 7s27p4 (a guess based upon polonium)
e- 's per energy level	2, 8, 18, 32, 32, 18, 6
State of matter	presumably a solid

Ununhexium is the temporary name of an unconfirmed synthetic superheavy element in the periodic table that has the temporary symbol Uuh and has the atomic number 116.

History

In January, 2001 the Joint Institute for Nuclear Research, Dubna, published results [1] that described the decay of the isotope ²⁹²Uuh, which was produced in the reaction of ²⁴⁸Cm with ⁴⁸Ca. It has a half-life of about 0.6 milliseconds (0.0006 seconds) and decayed into ²⁸⁸Uuq.

In 1999, researchers at Lawrence Berkeley National Laboratory announced the discovery of elements 116 and 118 (see ununoctium), in a paper published in Physical Review Letters. The following year, they published a retraction after other researchers were unable to duplicate the results. In June 2002, the director of the lab announced that the original claim of the discovery of these two elements had been based on data fabricated by the principal author Victor Ninov.

Ununhexium is a temporary IUPAC systematic element name.

[1] Y. T. Oganessian, et al., Observation of the decay of(292)116, Phys. Rev. C 63, 011301 (2001).

External link

• WebElements.com - Uuh

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