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This is roentgenium.

Symbol Rg
Atomic number 111
Atomic mass (272) amu

Roentgenium was officially discovered at the Gesellschaft für Schwerionenforschung (GSI) in Darmstadt, Germany on December 8, 1994. In 2001, the IUPAC/IUPAP Joint Working Party (JWP) concluded that there was insufficient evidence for the discovery. In 2004, element 111's official name of roentgenium (Rg) was accepted.

See also

Periodic table of the elements