Ununtrium (IPA: /ˌjuːˈnʌntriəm/), or eka-thallium, is the temporary name of a synthetic element in the periodic table that has the temporary symbol Uut and has the atomic number 113. It comes from the alpha decay (release of a helium nucleus) of ununpentium. Following periodic trends it is expected to be a soft, silvery highly reactive metal, rather like sodium.

1 History
2 Name
3 See also
4 References
5 External links

[edit] History

On February 1, 2004, the discovery of ununtrium and ununpentium were reported by a team composed of Russian scientists at Dubna (Joint Institute for Nuclear Research), and American scientists at the Lawrence Livermore National Laboratory.

On September 28, 2004, a team of Japanese scientists declared that they succeeded in synthesizing the element. <ref>Morita et al, Experiment on the Synthesis of Element 113 in the Reaction ²⁰⁹Bi(⁷⁰Zn, n)²⁷⁸113, J. Phys. Soc. Jpn., Vol. 73, No.10. Also press release in Japanese</ref>,[1]

In May 2006, at 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).

[edit] Name

Ununtrium is a temporary IUPAC systematic element name. Scientists from Japan proposed for the element the name japonium (symbol Jp) or rikenium (Rk) [2].