Ununtrium

Ununtrium is the temporary name of a synthetic element with the temporary symbol Uut and atomic number 113. It is placed as the heaviest member of the group 13 (IIIA) elements although a sufficiently stable isotope is not known at this time that would allow chemical experiments to confirm its position as a heavier homologue to thallium. It was first detected in 2003 in the decay of ununpentium and was synthesized directly in 2004. Only fourteen a... More

Ununtrium is the temporary name of a synthetic element with the temporary symbol Uut and atomic number 113. It is placed as the heaviest member of the group 13 (IIIA) elements although a sufficiently stable isotope is not known at this time that would allow chemical experiments to confirm its position as a heavier homologue to thallium. It was first detected in 2003 in the decay of ununpentium and was synthesized directly in 2004. Only fourteen atoms of ununtrium have been observed to date. The longest-lived isotope known is Uut with a half-life of ~20 s, allowing first chemical experiments to study its chemistry. The first report of ununtrium was in August 2003 when it was identified as a decay product of ununpentium. These results were published on February 1, 2004, by a team composed of Russian scientists at Dubna (Joint Institute for Nuclear Research), and American scientists at the Lawrence Livermore National Laboratory. On July 23, 2004, a team of Japanese scientists at RIKEN...

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