Bohrium - Video Learning - WizScience.com
"Bohrium" is a chemical element with
symbol "Bh" and atomic number 107. It is named after
Danish physicist
Niels Bohr. It is a synthetic element and radioactive; the most stable known isotope, 270 Bh, has a half-life of approximately 61 seconds
.
In the periodic table of the elements, it is a d-block transactinide element. It is a member of the 7th period and belongs to the group 7 elements.
Chemistry experiments have confirmed that bohrium behaves as the heavier homologue to rhenium in group 7. The chemical properties of bohrium are characterized only partly, but they compare well with the chemistry of the other group 7 elements.
Bohrium was first convincingly synthesized in
1976 by a
Russian research team led by
Yuri Oganessian. The team bombarded a target of bismuth-209 with accelerated nuclei of chromium-54 to produce 5 atoms of the isotope bohrium-262:
The
IUPAC/
IUPAP Transfermium Working Group recognised the
GSI collaboration as official discoverers in their
1992 report.
The German group suggested the name "nielsbohrium" with symbol "Ns" to honor the Danish physicist Niels Bohr.
The Soviet scientists at the
Joint Institute for Nuclear Research in
Dubna, Russia had suggested this name be given to element 105 and the
German team wished to recognise both Bohr and the fact that the
Dubna team had been the first to propose the cold fusion reaction to solve the controversial problem of the naming of element 105. The Dubna team agreed with the German group's naming proposal for element 107.
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