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Chemical Fact Sheet

Bohrium

Chemical Abstract Number (CAS #) 54037-14-8
Analytical Methods 200.8 - 6020
Atomic Symbol Bh

Synopsis from the CRC Handbook of Chemistry and Physics 92nd Edition 2011-2013

Bohrium — (Named after Niels Bohr [1885–1962], Danish atomic and nuclear physicist.) Bh; at. wt. [264]. at. no. 107. Bohrium is expected to have chemical properties similar to rhenium. This element was synthesized and unambiguously identified in 1981 using the Universal Linear Accelerator (UNILAC) at the Gesellschaft für Schwerionenforschung (G.S.I.) in Darmstadt, Germany. The discovery team was led by Armbruster and Münzenberg. The reaction producing the element was proposed and applied earlier by a Dubna Group led by Oganessian in 1976. A target of 209Bi was bombarded by a beam of 54Cr ions. In 1983 experiments at Dubna using the 157-inch cyclotron, produced 262107 by the reaction 209Bi + 54Cr. The alpha decay of 246Cf, the sixth member in the decay chain of 262107, served to establish a 1-neutron reaction channel. The IUPAC adopted the name Bohrium with the symbol Bh for Element 107 in August 1997. Five isotopes of bohrium are now recognized. One isotope of bohrium appears to have a relatively long life of 15 seconds. Work on this relatively longlived isotope has been performed with the 88-inch cyclotron at the Lawrence-Berkeley National Laboratory.
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