ROENTGENIUM

TRANSITION ELEMENT: COPPER GROUP

Atomic number:	111
Group numbers:	11
Period:	7
Electronic configuration:	[Rn] 5f¹⁴ 6d¹⁰ 7s¹
Formal oxidation number:
Electronegativities:	-
Atomic radius / pm:	-
Relative atomic mass:	-

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 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.

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 ELEMENT
in the atmosphere / ppm:	-
in the Earth's crust / ppm:	-
in the oceans / ppm:	-

CRYSTALLOGRAPHIC DATA
Crystal structure:	unknown structure
Unit-cell dimensions / pm:	-
Space group:	-

ISOTOPES
Isotope	Relative atomic mass	Mass percent (%)
²⁸¹Rg	281.166(6)	*
²⁸²Rg	282.169(5)	*

REDUCTION POTENTIALS
Balanced half-reaction	E^o / V

110 Darmstadtium

←

111 Roentgenium

→

112 Copernicium

Citing this page:

Generalic, Eni. "Roentgenium." EniG. Periodic Table of the Elements. KTF-Split, 18 Jan. 2024. Web. {Date of access}. <https://www.periodni.com/rg.html>.

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