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Bohrium


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Atomic Number:107
Atomic Symbol:Bh
Atomic Weight:272Electron Configuration:[Rn] 5f14 6d5 7s2
Shells:2,8,18,32,32,13,2Filling Orbital:
Melting Point:No Data
Boiling Point:No Data
Description:Radioactive metal.


History

First produced in 1976 by scientists working at the Joint Institute for Nuclear Research in Dubna, Russia, and later confirmed in 1981 by Peter Armbruster, Gottfried M??nzenber and their team working at the Gesellschaft f??r Schwerionenforschung in Darmstadt, Germany, bohrium was produced by bombarding a target of bismuth-209 with ions of chromium-54.
Bohrium's most stable isotope, bohrium-272, has a half-life of about 9.8 seconds. It decays into dubnium-268 through alpha decay.
Since only a few atoms of bohrium have ever been made, there are currently no uses for bohrium outside of basic scientific research.


Source:

Bohrium is produced synthetically by cold fusion.


Properties

Extrapolated chemical properties


Oxidation states

Element 107 is projected to be the fourth member of the 6d series of transition metals and the heaviest member of group VII in the Periodic Table, below manganese, technetium and rhenium. All the members of the group readily portray their group oxidation state of +7 and the state becomes more stable as the group is descended. Thus bohrium is expected to form a stable +7 state. Technetium also shows a stable +4 state whilst rhenium exhibits stable +4 and +3 states. Bohrium may therefore show these lower states as well.


Chemistry

The heavier members of the group are known to form volatile heptoxides M2O7, so bohrium should also form the volatile oxide Bh2O7. The oxide should dissolve in water to form perbohric acid, HBhO4. Rhenium and technetium form a range of oxyhalides from the halogenation of the oxide. The chlorination of the oxide forms the oxychlorides MO3Cl, so BhO3Cl should be formed in this reaction. Fluorination results in MO3F and MO2F3 for the heavier elements in addition to the rhenium compounds ReOF5 and ReF7. Therefore, oxyfluoride formation for bohrium may help to indicate eka-rhenium properties.


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