Periodic table

 

 

Atomic number:111

Group numbers:11

Period:7

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

Formal oxidation number:

Electronegativities:-

Atomic radius / pm:-

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.

PHYSICAL PROPERTIES

Density / g dm^-3:-

Molar volume / cm³mol^-1:-

Electrical resistivity / μΩcm:- (20 °C)

THERMAL PROPERTIES

Thermal conductivity / W m^-1K^-1:-

Melting point / °C:-

Boiling point / °C:-

Heat of fusion / kJ mol^-1:-

Heat of vaporization / kJ mol^-1:-

Heat of atomization / kJ mol^-1:-

IONIZATION ENERGIES

First ionization energy / kJ mol^-1:-

Second ionization energy / kJ mol^-1:-

Third ionization energy / kJ mol^-1:-

ABUNDANCE OF ELEMENTS

in the atmosphere / ppm:-

in the Earth's crust / ppm:-

in the oceans / ppm:-

CRYSTALLOGRAPHIC DATA

ISOTOPES

REDUCTION POTENTIALS

 

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Citing this page:

Generalic, Eni. "Roentgenium." EniG. Periodic Table of the Elements. 16 May 2013. KTF-Split. {Date of access}. <http://www.periodni.com/rg.html>.