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Hassium is a synthetic chemical element; it has symbol Hs and atomic number 108. It is highly radioactive: its most stable known isotopes have half-lives of about ten seconds. [a] One of its isotopes, 270 Hs, has magic numbers of protons and neutrons for deformed nuclei, giving it greater stability against spontaneous fission.
Hassium (108 Hs) is a synthetic element, and thus a standard atomic weight cannot be given. Like all synthetic elements, it has no stable isotopes. The first isotope to be synthesized was 265 Hs in 1984. There are 13 known isotopes from 263 Hs to 277 Hs and up to six isomers.
In 1997, a committee of IUPAC recommended that element 108 be named hassium (Hs), in honor of the German state of Hesse (or Hassia in Latin). This state includes the city of Darmstadt, which is home to the GSI Helmholtz Centre for Heavy Ion Research where several new elements were discovered or confirmed. The element name was accepted ...
The German group at the Gesellschaft für Schwerionenforschung (GSI) in Darmstadt, who had (undisputedly) discovered elements 107 to 109, were dragged into the controversy when the Commission suggested that the name "hahnium", proposed for element 105 by the Americans, be used for GSI's element 108 instead.
108 Hassium, Hs, for Hassia , location ... Experimental evidence shows that elements 103–108 behave as expected for their position in the periodic table, as heavier ...
The GSI team had originally proposed nielsbohrium (Ns) to resolve the naming dispute on element 105, but this was changed by IUPAC as there was no precedent for using a scientist's first name in an element name. 108. hassium, Hs, named after the Latin form of the name of Hessen, the German Bundesland where this work was performed (1984). This ...
Hassium is a highly radioactive chemical element with symbol Hs and atomic number 108. The most stable known isotopes have half-lives of around 10 seconds. Natural occurrences of this superheavy element have been hypothesised, but none has ever been found.
For example, "Uno" was the temporary symbol for hassium (element 108) which had the temporary name of unniloctium, based on the digits of its atomic number. There are also some historical symbols that are no longer officially used.