Atomic number:111

Group numbers:11

Period:7

Electronic configuration:[Rn] 5f¹⁴ 6d¹⁰ 7s¹

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Relative atomic mass:[280]

 

Roentgenium was discovered by S. Hofmann (DE) et al. collaboration at the Heavy Ion Research Laboratory (Gesellschaft für Schwerionenforschung, GSI) in Darmstadt, Germany in December 1994. Named in honour of Wilhelm Conrad Roentgen. It is a synthetic radioactive metal. It is created in the bombardments of 209Bi targets with 64Ni using the velocity selector SHIP facility to discriminate in favor of the fused product, 272111 + 1n, three sets of localized alpha-decay chains were observed with position-sensitive detectors.

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