Chemical investigation of hassium (element 108)

Ch. E. Düllmann, W. Brüchle, R. Dressler, K. Eberhardt, B. Eichler, R. Eichler, H. W. Gäggeler (), T. N. Ginter, F. Glaus, K. E. Gregorich, D. C. Hoffman, E. Jäger, D. T. Jost, U. W. Kirbach, D. M. Lee, H. Nitsche, J. B. Patin, V. Pershina, D. Piguet, Z. Qin, M. Schädel, B. Schausten, E. Schimpf, H.-J. Schött, S. Soverna, R. Sudowe, P. Thörle, S. N. Timokhin, N. Trautmann, A. Türler, A. Vahle, G. Wirth, A. B. Yakushev and P. M. Zielinski
Additional contact information
Ch. E. Düllmann: Universität Bern
W. Brüchle: Gesellschaft für Schwerionenforschung mbH
R. Dressler: Labor für Radio- und Umweltchemie, Paul Scherrer Institut
K. Eberhardt: Universität Mainz
B. Eichler: Labor für Radio- und Umweltchemie, Paul Scherrer Institut
R. Eichler: Labor für Radio- und Umweltchemie, Paul Scherrer Institut
H. W. Gäggeler: Universität Bern
T. N. Ginter: Lawrence Berkeley National Laboratory
F. Glaus: Labor für Radio- und Umweltchemie, Paul Scherrer Institut
K. E. Gregorich: Lawrence Berkeley National Laboratory
D. C. Hoffman: Lawrence Berkeley National Laboratory
E. Jäger: Gesellschaft für Schwerionenforschung mbH
D. T. Jost: Labor für Radio- und Umweltchemie, Paul Scherrer Institut
U. W. Kirbach: Lawrence Berkeley National Laboratory
D. M. Lee: Lawrence Berkeley National Laboratory
H. Nitsche: Lawrence Berkeley National Laboratory
J. B. Patin: Lawrence Berkeley National Laboratory
V. Pershina: Gesellschaft für Schwerionenforschung mbH
D. Piguet: Labor für Radio- und Umweltchemie, Paul Scherrer Institut
Z. Qin: Institute of Modern Physics, Chinese Academy of Sciences
M. Schädel: Gesellschaft für Schwerionenforschung mbH
B. Schausten: Gesellschaft für Schwerionenforschung mbH
E. Schimpf: Gesellschaft für Schwerionenforschung mbH
H.-J. Schött: Gesellschaft für Schwerionenforschung mbH
S. Soverna: Universität Bern
R. Sudowe: Lawrence Berkeley National Laboratory
P. Thörle: Universität Mainz
S. N. Timokhin: Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research
N. Trautmann: Universität Mainz
A. Türler: Institut für Radiochemie, Technische Universität München
A. Vahle: Research Center Rossendorf e.V.
G. Wirth: Gesellschaft für Schwerionenforschung mbH
A. B. Yakushev: Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research
P. M. Zielinski: Lawrence Berkeley National Laboratory

Nature, 2002, vol. 418, issue 6900, 859-862

Abstract: Abstract The periodic table provides a classification of the chemical properties of the elements. But for the heaviest elements, the transactinides, this role of the periodic table reaches its limits because increasingly strong relativistic effects on the valence electron shells can induce deviations from known trends in chemical properties1,2,3,4. In the case of the first two transactinides, elements 104 and 105, relativistic effects do indeed influence their chemical properties5, whereas elements 106 and 107 both behave as expected from their position within the periodic table6,7. Here we report the chemical separation and characterization of only seven detected atoms of element 108 (hassium, Hs), which were generated as isotopes 269Hs (refs 8, 9) and 270Hs (ref. 10) in the fusion reaction between 26Mg and 248Cm. The hassium atoms are immediately oxidized to a highly volatile oxide, presumably HsO4, for which we determine an enthalpy of adsorption on our detector surface that is comparable to the adsorption enthalpy determined under identical conditions for the osmium oxide OsO4. These results provide evidence that the chemical properties of hassium and its lighter homologue osmium are similar, thus confirming that hassium exhibits properties as expected from its position in group 8 of the periodic table.

Date: 2002
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DOI: 10.1038/nature00980

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