Ununtrium

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113 ununbium ← ununtrium → ununquadium
Tl
↑
Uut
↓
(Uht)
Periodic Table - Extended Periodic Table
General
Name, Symbol, Number ununtrium, Uut, 113
Chemical series presumably poor metals
Group, Period, Block 13, 7, p
Appearance unknown, probably silvery
white or metallic gray
Standard atomic weight (293)  g·mol−1
Electron configuration perhaps [Rn] 5f14 6d10 7s2 7p1
(guess based on thallium)
Electrons per shell 2, 8, 18, 32, 32, 18, 3
Phase presumably a solid
CAS registry number 54084-70-7
Selected isotopes
Main article: Isotopes of ununtrium
iso NA half-life DM DE (MeV) DP
284Uut syn 0.48 s
References

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.

Contents

  • 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 at RIKEN declared that they succeeded in synthesizing the element.[1][2]

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) after RIKEN.[3]