where is this used?
It is used in the field of Experimental chemistry.
Hassium
 Despite this selection for gas-phase chemical studies being clear from the beginning, chemical characterization of hassium was considered a difficult task for a long time. Although hassium isotopes were first synthesized in 1984, it was not until 1996 that a hassium isotope long-lived enough to allow chemical studies was synthesized
what is hassium? It is a chemical element. where is it naturally found? It is not known to occur naturally on Earth. is it used in any fusion reactions? Yes, it was used in Cold fusion. where does the name of the element come from? Under Mendeleev's nomenclature, It would be known as "eka-osmium", as in "the first element below osmium in the periodic table". what are the physical properties of the above-mentioned element? It should crystallize in the hexagonal close-packed structure.
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Hassium [SEP] Experimental chemistry
The first goal for chemical investigation was the formation of the tetroxide; it was chosen because ruthenium and osmium form volatile tetroxides, being the only transition metals to display a stable compound in the +8 oxidation state. Despite this selection for gas-phase chemical studies being clear from the beginning, chemical characterization of hassium was considered a difficult task for a long time. Although hassium isotopes were first synthesized in 1984, it was not until 1996 that a hassium isotope long-lived enough to allow chemical studies was synthesized. Unfortunately, this hassium isotope, Hs, was synthesized indirectly from the decay of Cn; not only are indirect synthesis methods not favourable for chemical studies, but the reaction that produced the isotope Cn had a low yield—its cross section was only 1 pb—and thus did not provide enough hassium atoms for a chemical investigation.