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hassium

hassium (hăs´ēəm, häs´–), artificially produced radioactive chemical element; symbol Hs; at. no. 108; mass number of most stable isotope 277; m.p., b.p., sp. gr., and valence unknown. Situated in Group 8 of the periodic table, it is expected to have properties similar to those of osmium.

In 1984 a German research team led by P. Armbruster and G. Münzenberg at the Institute for Heavy Ion Research at Darmstadt bombarded lead-208 atoms with iron-58 ions. In 10 days of bombardment, they successfully produced three atoms of an isotope of element 108 with mass number 265 and a half-life of only 2 msec. They suggested that the new element be named hassium, which is derived from the Latin name for the German state of Hesse, where the institute is located. In 1994 a committee of the International Union of Pure and Applied Chemistry (IUPAC), convened to resolve naming disputes for the transactinide elements, recommended that element 108 be named hahnium. The name hassium was adopted internationally, however, in 1997. The most stable isotope of hassium, hassium-277, has a half-life of approximately 11 min.

See also synthetic elements; transuranium elements.

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hassium

hassium (symbol Hs) Synthetic, radioactive transactinide element. It is a very unstable element that is produced by high-energy atomic collisions. It was discovered in 1984 by German physicists Peter Armbruster and Gottfried Münzenberg. Named after the Latin Hassia for ‘Germany’, it was formerly named hahnium. Properties: at.no. 108; r.a.m. 277.

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