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Additional
ununpentium
English Wikipedia - The Free Encyclopedia
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Ununpentium
Ununpentium
is the
temporary name
of a
synthetic
superheavy element
in the
periodic table
that has the temporary symbol
Uup
and has the
atomic number
115. It is an extremely
radioactive
element; its most stable known isotope, ununpentium-289, has a
half-life
of only 220
milliseconds
. It is also known as
eka
-
bismuth
or simply
element 115
. Ununpentium was first created in 2003 by a team composed of Russian scientists at the
Joint Institute for Nuclear Research
(JINR) in
Dubna
, and American scientists at the
Lawrence Livermore National Laboratory
. In December 2015, it was recognized as a new element by the
International Union of Pure and Applied Chemistry
(IUPAC) and the
International Union of Pure and Applied Physics
(IUPAP). About 100 atoms of ununpentium have been observed to date, all of which have been shown to have mass numbers from 287 to 290.
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