Roentgenium is a synthetic chemical element with the symbol Rg and atomic number 111. It is named in honor of the German physicist Wilhelm Röntgen, who is known for discovering X-rays. Roentgenium is part of the group of elements known as the transition metals and is located in period 7 of the periodic table. This element was first synthesized in 1994 at the GSI Helmholtz Centre for Heavy Ion Research in Germany.
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