• Latin name:
  Roentgenium
• English name:
  Roentgenium
• Year discovered:
  1994
• Discovered by:
  GSI (Helmholtzzentrum für Schwerionenforschung)
• Country of Discovery:
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• Cost per 100 grams:
  ----
• CAS Number:
  CAS54386-24-2
• Electron shell:
  K2-L8-M18-N32-O32-P18-Q1-R0

Roentgenium is a chemical element with symbol Rg and atomic number 111. It is an extremely radioactive synthetic element (an element that can be created in a laboratory but is not found in nature); the most stable known isotope, roentgenium-282, has a half-life of 2.1 minutes. Roentgenium was first created in 1994 by the GSI Helmholtz Centre for Heavy Ion Research near Darmstadt, Germany.

• Atomic number:
  111
• Atomic weight (Relative atomic mass):
  283.085549304907 (g/mol)
• Density:
  ----
• Melting point:
  ----
• Boiling point:
  ----
• Valence electrons:
  ----
• Period:
  7
• Group:
  
• Block:
  d - block
• Emission spectrum:
  ----

• Phase:
  Solid

  
• Fusion heat:
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• Specific heat:
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• Thermal expansion:
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• Vaporization heat:
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• Electron configuration:
  [Rn] 5f14 6d9 7s2 = 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 6d9 7s2
Oxidation states:

• 0
• -1
• -
• -
• -
• -
• +1
• -
• +3
• -
• +5
• -
• +7
• -
• -
• Ion charge:
  ----
• The ionization potential of an atom:
  ----
• Atomic radius:
  ----
• Covalent radius:
  121 (pm)
• Van der Waals radius:
  ----

• Electrical conductivity:
  ----
• Electrical type:
  ----
• Magnetic type:
  ----
• Volume magnetic susceptibility:
  ----
• Mass magnetic susceptibility:
  ----
• Molar magnetic susceptibility:
  ----
• Resistivity:
  ----
• Superconducting point:
  ----

• Debye temperature:
  ----

• Colour:
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• CAS Number:
  CAS54386-24-2
• CID Number:
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• RTEC Number:
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• Brinell hardness:
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• Mohs hardness:
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• Vickers hardness:
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• Bulk modulus:
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• Young's modulus:
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• Liquid density:
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• Molar volume:
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• Poisson's ratio:
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• Shear modulus:
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• Speed of sound transmission:
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• Refractive index:
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• Thermal conductivity:
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• Electronegativity:
  ----
• Valence electrons:
  ----
• Electron affinity:
  151.0 kJ/mole

• Radioactive:
  Yes
• Half life:
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• Lifetime:
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• Neutron cross section, barn:
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• Universe contains "Roentgenium" at the rate of
  ----
• Sun contains "Roentgenium" at the rate of
  ----
• Oceans contain "Roentgenium" at the rate of
  ----
• Human body contains "Roentgenium" at the rate of
  ----
• The Earth's crust consists of "Roentgenium" at the rate of
  ----
• Meteorites consist of "Roentgenium" at the rate of
  ----