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Ununhexium [Uuh]
CAS-ID: 54100-71-9
An: 116 N: 173
Am: [292] g/mol
Group No: 16
Group Name: Chalcogen
Block: p-block  Period: 7
State: presumably a solid at 298 K
Colour: unknown, but probably metallic and silvery white or grey in appearance Classification: Metallic
Boiling Point: unknown
Melting Point: unknown
Density: unknown
Availability: This item is purely synthetic and is not available commercially.
Discovery Information
Who: Dubna (Joint Institute for Nuclear Research)
When: 2000
Where: Russia
Name Origin
From the latin for "one one six".
 "Ununhexium" in different languages.
Sources
Synthetically produced element.
Uses
None.
History
In December, 2000 the Joint Institute for Nuclear Research (Dubna, Russia) published results that described the discovery in 2000 of decay of the isotope 292Uuh, which was produced in the reaction of 248Cm with 48Ca. It has a half-life of about 18 milliseconds (0.018 seconds) and decayed into 288Uuq (ununquadium, element 114). On May 11, 2001, the institute reported synthesizing a second atom, and that the properties confirmed a region of "enhanced" stability.
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).
Notes
In 1999, researchers at Lawrence Berkeley National Laboratory announced the discovery of elements 116 and 118 (ununhexium and 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.