History and Production
Named after the German state, Hesse. It was discovered in 1984 by P. Armbruster and G. Münzenberg at Darmstadt, Germany. Using the Universal Linear Accelerator, a beam of 58Fe was produce to bombard a 208Pb target. 265Hs was reported to have produced in this experiment.
The name hassium was adopted by IUPAC in 1997.
Since only a few atoms have been produced which decay by spontaneous fission, its physical properties are largely unknown.
Interatomic distance: -
Melting point: n/a
Boiling point: n/a
Thermal conductivity/Wm-1K-1: n/a
Density/kgm-3: 41000 (est.)
Standard Thermodynamic Data (atomic gas)
Enthalpy of formation: -
Gibbs free energy of formation: -
Heat capacity: -
Electronic configuration: Electronic configuration: [Rn] 5f14 6d6 7s2
Term symbol: 5D4
Electron affinity: - Electronegativity (Pauline): -
Ionization energy (first, second, third): -, -, - kJ/mol