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hassium

hassium (hăsˈēəm, häsˈ–) [key], 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.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

More on hassium from Infoplease:

  • Periodic Table of the Elements: Hassium - Periodic Table of the Elements: Hassium Atomic Number: 108 Atomic Symbol: Hs Hassium Atomic Weight: ...
  • Hs - Hs Hs, symbol for the element hassium.
  • Ha - Ha Ha, formerly the suggested symbol for the name hahnium, which was applied variously to two ...
  • hahnium - hahnium hahnium , symbol Ha, former suggested name for both element 105, now called dubnium, and ...
  • ununquadium - ununquadium ununquadium , artificially produced radioactive chemical element; symbol Uuq; at. no. ...

See more Encyclopedia articles on: Compounds and Elements


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