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Meitnerium
Meitnerium
is a
chemical element
with symbol
Mt
and
atomic number
109. It is an extremely
radioactive
synthetic element
(an element not found in nature that can be created in a laboratory). The most stable known isotope, meitnerium-278, has a
half-life
of 7.6 seconds. The
GSI Helmholtz Centre for Heavy Ion Research
near
Darmstadt
, Germany, first created this element in 1982. It is named for
Lise Meitner
.
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