NO. 111Unknown

Rg

Roentgenium

Roentgenium is a superheavy element expected to share properties with gold, but only a few atoms have ever been observed.

Crystal Structure

Face-centered cubic (predicted)

Atomic Mass282 u

Density23 g/cm³

Melting Point2000 K

Boiling Point4200 K

Atomic Radius121 pm

Electronegativity1.3

Ionization Energy650 kJ/mol

Electron Affinity0 kJ/mol

Bonding TypeMetallic

Oxidation States1, 3

Acid/BaseUnknown

ReactivityUnknown

Electron Configuration

[Rn] 5f14 6d9 7s2

Discovered ByGSI Darmstadt

Year1994

Known Isotopes

Rg-282