Ununtrium

General properties
Name, symbol, number	ununtrium, Uut, 113
Element category	unknown presumably post-transition metals
Group, period, block	13, 7, p
Standard atomic weight	(286)
Electron configuration	[Rn] 5f14 6d10 7s2 7p1 (predicted) 2, 8, 18, 32, 32, 18, 3 (predicted)
History
Discovery	Joint Institute for Nuclear Research and Lawrence Livermore National Laboratory (2003)

Ununtrium is the temporary name of a chemical element with the temporary symbol Uut and atomic number 113. It is an extremely radioactive synthetic element (an element that can be created in a laboratory but is not found in nature); the most stable known isotope, ununtrium-286, has a half-life of 20 seconds. Ununtrium was first created in 2003 by the Joint Institute for Nuclear Research in Dubna, Russia.

In the periodic table, it is a p-block transactinide element. It is a member of the 7th period and is placed in the boron group, although no chemical experiments have been carried out to confirm that it behaves as the heavier homologue to thallium in the boron group. Ununtrium is calculated to have some similar properties to its lighter homologues, boron, aluminium, gallium, indium, and thallium, although it should also show several major differences from them. Unlike all the other p-block elements, it is even predicted to show some transition metal character.

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