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Re

Os

Ir

Bh

Hs

Mt

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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

hassium sample

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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