Relative atomic mass: [280]

English: Roentgenium
French: Roentgenium
Croatian: Roentgenij
German: Roentgenium
Italian: Roentgenio
Spanish: Roentgenio

Atomic number: 111
Group numbers: 11
Period: 7
Standard state (20 oC): solid

Discovery: 1994 Sigurd Hofmann & GSI Darmstadt (DE)
Roentgenium was discovered by S. Hofmann (DE) et al. collaboration at the Heavy Ion Research Laboratory (Gesellschaft fur Schwerionenforschung, GSI) in Darmstadt, Germany in December 1994. Named in honour of Wilhelm Conrad Roentgen. It is a synthetic radioactive metal. It was created in the bombardments of 209Bi targets with 64Ni using the velocity selector SHIP facility to discriminate in favor of the fused product, 272Rg + 1n, three sets of localized alpha-decay chains were observed with position-sensitive detectors.
Electronic configuration: [Rn] 5f14 6d10 7s1
Formal oxidation number: 
Atomic radius: - pm

Electronegativities: -
Thermal conductivity: - W/(m K)
Electrical resistivity (20 oC): - microOhm cm

Melting point: - oC
Boiling point: - oC

Heat of fusion: - kJ/mol
Heat of vaporization: - kJ/mol
Heat of atomization: - kJ/mol

110Ds <= 111Rg => 112Cn

ASCII Periodic Table of the Elements
6 Jan. 2020
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