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Additional
roentgenium
English Wikipedia - The Free Encyclopedia
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Roentgenium
Roentgenium
is a
chemical element
with symbol
Rg
and
atomic number
111. 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, roentgenium-282, has a
half-life
of 2.1 minutes. Roentgenium was first created in 1994 by the
GSI Helmholtz Centre for Heavy Ion Research
near
Darmstadt
, Germany. It is named after the physicist
Wilhelm Röntgen
(also spelled Roentgen).
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