Hassium, with the chemical symbol Hs and atomic number 108, is an artificially produced chemical element that was first synthesized in 1984 at the Gesellschaft für Schwerionenforschung (GSI) in Darmstadt, Germany. The discovery is credited to the research of Peter Armbruster, Gottfried Münzenberg, and their teams. Hassium was created through the fusion of lead-208 with iron-58 nuclei.

The name "Hassium" was chosen to commemorate the German region of Hesse, where the GSI is located. The discovery of Hassium contributed to deepening the understanding of the properties and existence of the heaviest elements in the periodic table. Hassium is extremely rare on Earth and does not occur naturally. It is artificially produced in particle accelerators and has limited applications, mainly in the research of the chemical properties of transuranic elements.

The key Hassium isotopes are Hassium-270 and Hassium-277. Hassium-270 has a half-life of about 22 seconds, while Hassium-277 is approximately 52 seconds.

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