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Ununtrium
Ununtrium
is a
chemical element
with
atomic number
113. It has a
temporary name
and temporary symbol
Uut
. It is a
synthetic element
(an element that can be created in a laboratory but is not found in nature) and is extremely
radioactive
; its most stable known isotope, ununtrium-286, has a
half-life
of 20 seconds. It is also known as
eka
-
thallium
or simply
element 113
. Ununtrium was first reported to have been created in 2003 by the
Joint Institute for Nuclear Research
in
Dubna
, Russia, and in 2004 by a team of Japanese scientists at
RIKEN
. In December 2015, the
International Union of Pure and Applied Chemistry
(IUPAC) and the
International Union of Pure and Applied Physics
(IUPAP) recognized the element and assigned the priority of the discovery to RIKEN.
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