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