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Roentgenium , including Technical Data, Safety Data and its high purity propertiesresearch, applications and other useful facts are discussed below. Scientific facts such as the atomic structureionization energyabundance on Earth,conductivity and thermal properties are included.

Roentgenium‘s appearance is unknown. Little is known about the element and it has no known uses. Roentgenium is a synthetic element that is not present in the environment.

Roentgenium is a is a D-Block, Group 11, Period 7 element. The number of electrons in each of Roentgenium‘s shells is 2, 8, 18, 32, 32, 18, 1 and its electronic configuration is [Rn] 5f14 6d10 7s1. In its elemental form Roentgenium‘s CAS number is 54386-24-2.

Roentgenium was discovered on December 8, 1994 at the Gesellschaft für Schwerionenforschung (GSI) in Darmstadt, Germany by Sigurd Hofmann, Peter Armbruster and Gottfried Münzenberg along with a team of scientists.

Abundance. The following table shows the abundance of Roentgenium and each of its naturally occurring isotopes on Earth along with the atomic mass for each isotope.

Isotope Atomic Mass % Abundance on Earth
Rg-272 272.1535 -
Rg-279 279 -
Rg-280 280 -

The following table shows the abundance of Roentgenium present in the human body and in the universe scaled to parts per billion (ppb) by weight and by atom:

  Typical Human Body Universe
by Weight - -
by Atom - -

Ionization Energy. The ionization energy for Roentgenium (the least required energy to release a single electron from the atom in it‘s ground state in the gas phase) is stated in the following table:
1st Ionization Energy kJ mol-1
2nd Ionization Energy kJ mol-1

Conductivity. No data. 

Thermal Properties. The melting point and boiling point for Roentgenium are stated below. The following chart sets forth the heat of fusion, heat of vaporization and heat of atomization.
Heat of Fusion No data
Heat of Vaporization No data
Heat of Atomization No data

Formula Atomic Number Molecular Weight Electronegativity (Pauling) Density Melting Point Boiling Point Vanderwaals radius Ionic radius Energy of first ionization
Rg 111 [280]