Hassium (/ˈhæsiəm/ HASS-ee-əm or /ˈhɑːsiəm/ HAH-see-əm) is a synthetic element with the symbol Hs and atomic number 108. It is the heaviest member of the group 8 (VIII) elements. The element was first observed in 1984. Experiments have confirmed that hassium is a typical member of group 8 showing a stable +8 oxidation state, analogous to osmium. Hassium is the heavier homologue of osmium.
Several isotopes are known, with Hs being the longest-live...
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Hassium (/ˈhæsiəm/ HASS-ee-əm or /ˈhɑːsiəm/ HAH-see-əm) is a synthetic element with the symbol Hs and atomic number 108. It is the heaviest member of the group 8 (VIII) elements. The element was first observed in 1984. Experiments have confirmed that hassium is a typical member of group 8 showing a stable +8 oxidation state, analogous to osmium. Hassium is the heavier homologue of osmium.
Several isotopes are known, with Hs being the longest-lived with a half-life of ~10 s. More than 100 atoms of hassium have been synthesized to date in various cold and hot fusion reactions, both as a parent nucleus and decay product.
Hassium was first synthesized in 1984 by a German research team led by Peter Armbruster and Gottfried Münzenberg at the Institute for Heavy Ion Research (Gesellschaft für Schwerionenforschung) in Darmstadt. The team bombarded a lead target with Fe nuclei to produce 3 atoms of Hs in the reaction:
The IUPAC/IUPAP Transfermium Working Group (TWG) recognised the GSI...
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