Chemical Fact Sheet
Element 108
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| Analytical Methods | 200.8 - 6020 |
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Synopsis
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Element 108 - This element was first synthesized and identified in 1984 by the same G.S.I. Darmstadt group who first identified Elements 107 and 109. Presumably this element will have chemical properties similar to osmium. Isotope 265-108 was produced using a beam of 58Fe projectiles produced by the Universal Linear Accelerator (UNILAC) to bombard a 208Pb target. Discovery of Elements 107 and 109 was made using detection of isotopes with odd proton and neutron numbers. Elements having even atomic numbers are thought to be less stable against spontaneous fusion than odd elements. The production of 265-108 in the same reaction as was used at G.S.I. was confirmed at Dubna with detection of the 7th member of the decay chain 253Es. Isotopes of Element 108 were believed to decay by spontaneous fission, explaining why 109 was produced before 108. Isotope 265-108 and 266-108 are thought to decay to 261-106, which in turn decays to 257-104 and 253No. The IUPAC recommends the name hahnium (Hn), honoring Otto Hahn, for this element; however, Element 105 has already been referred to as hahnium for many years, which would lead to confusion. The naming of Element 108 has not yet been settled. |
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