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ununtrium

ununtrium artificially produced radioactive chemical element; symbol Uut; at. no. 113; mass number of most stable isotope 284; m.p., b.p., sp. gr., and valence unknown. Situated in Group 13 of the periodic table , it is expected to have properties similar to those of thallium and indium .

In a 27-day experiment in 2003, scientists from the Joint Institute for Nuclear Research in Dubna, Russia, and Lawrence Livermore National Laboratory in California collaborated in the discovery of ununtrium. They bombarded atoms of americium -243 with ions of calcium -48. Among the products of the bombardment were four atoms of ununpentium (element 115), which in less than one tenth of a second decayed into atoms of ununtrium by emitting an alpha particle. Two isotopes of ununtrium were identified, the longer-lived (Uut-284) having a half-life of about 48 millisecondsc, and the other (Uut-283) a half-life of about 46.6 milliseconds. No name has yet been adopted for element 113, which is therefore called ununtrium, from the Latin roots un for one and tri for three, under a convention for neutral temporary names proposed by the International Union of Pure and Applied Chemistry (IUPAC) in 1980.

See also synthetic elements ; transactinide elements ; transuranium elements .

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	Periodic Table of the Elements: Ununtrium Book article from: The Columbia Encyclopedia, Sixth Edition Periodic Table of the Elements: Ununtrium Atomic Number: 113 Atomic Symbol: Uut   Ununtrium Atomic Weight: (284) Electron Configuration: 2 · 8 · 18 32 · 32 18 · 6 Read more
	element 113 Book article from: The Columbia Encyclopedia, Sixth Edition see ununtrium . Read more
	Uut Book article from: The Columbia Encyclopedia, Sixth Edition symbol for the element ununtrium . Read more
	ununpentium Book article from: The Columbia Encyclopedia, Sixth Edition ...ununpentium-287 and three atoms of ununpentium-288, each of which in less than one tenth of a second decayed into atoms of ununtrium by emitting an alpha particle. No name has yet been adopted for element 115, which is therefore called ununpentium, from the... Read more
	transuranium elements Book article from: The Columbia Encyclopedia, Sixth Edition ...114), and working jointly with the Lawrence Livermore National Laboratory (at Livermore, Calif.) claims to have produced ununtrium (at. no. 113) and ununpentium (at. no. 115). The Berkeley team claimed to have produced ununhexium (at. no. 116) and ununoctium... Read more

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