Hassium

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Hassium ( " eka- osmium ") is an exclusively artificially produced chemical element with the element symbol Hs and atomic number 108, it is one of the Transactinoiden (7th period d-block ).

History

Hassium was first produced on 14 March 1984 at the Society for Heavy Ion Research (GSI ) in Darmstadt by fusing lead with iron. It first bore the name Unniloctium (symbol Uno ). The 1994 recommendation of the IUPAC (see Elementnamensgebungskontroverse ) for the name was Hahnium (after Otto Hahn ). Since 1997, it takes its current name, derived from the Latin name Hassia for the state of Hesse.

Properties

Hassium is like most transactinides very short-lived. 265Hs has a half -life of 1.5 ms and 10 s 269Hs 277Hs is with a half-life of 16.5 minutes, the longest-lived isotope.

Compounds

2001 an oxygen compound of Hassiums could be produced at the GSI in Darmstadt. Due to the high volatility, these are most likely to Hassiumtetroxid 269HsO4, the analogue of the homologous osmium tetroxide. Despite the short half-life of two to three molecules of the researchers per day could lead to a Thermochromatographen on average. Surprisingly HsO4 showed a higher deposition temperature on the detector surfaces and thus less volatile than OsO4.

Safety

Classifications according to the Hazardous Substances Ordinance are not available because they only include the chemical danger and play a very minor role compared to the risks based on the radioactivity. Even the latter applies only if there is a relevant material for this amount.