Chemical characterization of bohrium (element 107)

R. Eichler, W. Brüchle, R. Dressler, Ch.E. Düllmann, B. Eichler, H. W. Gäggeler (), K. E. Gregorich, D. C. Hoffman, S. Hübener, D. T. Jost, U. W. Kirbach, C. A. Laue, V. M. Lavanchy, H. Nitsche, J. B. Patin, D. Piguet, M. Schädel, D. A. Shaughnessy, D. A. Strellis, S. Taut, L. Tobler, Y. S. Tsyganov, A. Türler, A. Vahle, P. A. Wilk and A. B. Yakushev
Additional contact information
R. Eichler: Departement für Chemie und Biochemie, Universität Bern
W. Brüchle: Gesellschaft für Schwerionenforschung
R. Dressler: Institut für Analytische Chemie, Technische Universität Dresden
Ch.E. Düllmann: Departement für Chemie und Biochemie, Universität Bern
B. Eichler: Labor für Radio- und Umweltchemie, Paul Scherrer Institut
H. W. Gäggeler: Departement für Chemie und Biochemie, Universität Bern
K. E. Gregorich: Lawrence Berkeley National Laboratory
D. C. Hoffman: Lawrence Berkeley National Laboratory
S. Hübener: Institut für Radiochemie, Forschungszentrum Rossendorf
D. T. Jost: Labor für Radio- und Umweltchemie, Paul Scherrer Institut
U. W. Kirbach: Lawrence Berkeley National Laboratory
C. A. Laue: Lawrence Berkeley National Laboratory
V. M. Lavanchy: Departement für Chemie und Biochemie, Universität Bern
H. Nitsche: Lawrence Berkeley National Laboratory
J. B. Patin: Lawrence Berkeley National Laboratory
D. Piguet: Labor für Radio- und Umweltchemie, Paul Scherrer Institut
M. Schädel: Gesellschaft für Schwerionenforschung
D. A. Shaughnessy: Lawrence Berkeley National Laboratory
D. A. Strellis: Lawrence Berkeley National Laboratory
S. Taut: Institut für Radiochemie, Forschungszentrum Rossendorf
L. Tobler: Labor für Radio- und Umweltchemie, Paul Scherrer Institut
Y. S. Tsyganov: Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research
A. Türler: Departement für Chemie und Biochemie, Universität Bern
A. Vahle: Institut für Radiochemie, Forschungszentrum Rossendorf
P. A. Wilk: Lawrence Berkeley National Laboratory
A. B. Yakushev: Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research

Nature, 2000, vol. 407, issue 6800, 63-65

Abstract: Abstract The arrangement of the chemical elements in the periodic table highlights resemblances in chemical properties, which reflect the elements’ electronic structure. For the heaviest elements, however, deviations in the periodicity of chemical properties are expected1,2,3: electrons in orbitals with a high probability density near the nucleus are accelerated by the large nuclear charges to relativistic velocities, which increase their binding energies and cause orbital contraction. This leads to more efficient screening of the nuclear charge and corresponding destabilization of the outer d and f orbitals: it is these changes that can give rise to unexpected chemical properties. The synthesis of increasingly heavy elements4,5,6, now including that of elements 114, 116 and 118, allows the investigation of this effect, provided sufficiently long-lived isotopes for chemical characterization are available7. In the case of elements 104 and 105, for example, relativistic effects interrupt characteristic trends in the chemical properties of the elements constituting the corresponding columns of the periodic table8, whereas element 106 behaves in accordance with the expected periodicity9,10,11,12. Here we report the chemical separation and characterization of six atoms of element 107 (bohrium, Bh), in the form of its oxychloride. We find that this compound is less volatile than the oxychlorides of the lighter elements of group VII, thus confirming relativistic calculations13 that predict the behaviour of bohrium, like that of element 106, to coincide with that expected on the basis of its position in the periodic table.

Date: 2000
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DOI: 10.1038/35024044

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