Re Os Ir Bh Hs Mt -- -- -- Element Fact There are around 120 known elements. Of these, 91 elements occur naturally on Earth. The rest no longer exist or are found only in traces as intermediate decay products alongside with other radioisotopes.

Hassium, Hs Atomic number: 108 Atomic mass: [267] (no stable nuclide) Natural abundance: - Isotopes: - 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. Physical Data 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: - Entropy: - Heat capacity: - Electronic data Electronic configuration: Electronic configuration: [Rn] 5f14 6d6 7s2 Term symbol: 5D4 Electron affinity: -   Electronegativity (Pauline): - Ionization energy (first, second, third): -, -, - kJ/mol Chemical properties

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