Bohrium Information
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Bohrium Element
Bohrium is a synthetic chemical
element with the symbol Bh and atomic number 107. It is named after Danish
physicist Niels Bohr. As a synthetic element, it can be created in a laboratory
but is not found in nature. All known isotopes of bohrium are extremely
radioactive; the most stable known isotope is 270Bh with a half-life of
approximately 61 seconds, though the unconfirmed 278Bh may have a longer
half-life of about 690 seconds.
In the periodic table, it is a
d-block transactinide element. It is a member of the 7th period and belongs to
the group 7 elements as the fifth member of the 6d series of transition metals.
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.
Properties of bohrium
Bohrium is a synthetic element
about which little is known. It is presumed to be a solid metal, but since only
a few atoms of it have been created, it is difficult to study. The German team
identified six nuclei of the element. [See Periodic Table of the Elements]
There are 10 isotopes of
bohrium with known half-lives. The most stable is 270Bh, which has a half-life
of about one minute.
The atomic weight for manmade
transuranium elements is based on the longest-lived isotope in the periodic
table. These atomic weights should be considered provisional since a new
isotope with a longer half-life could be produced in the future.
Sources of bohrium
Bohrium is produced
artificially and only small amounts have been made.
The Dubna team created it by
bombarding bismuth-204 (204Bi) with heavy nuclei of chromium-54 (54Cr). A
rapidly rotating cylinder, coated with a thin layer of bismuth, was used as a
target and bombarded with a stream of chromium fired tangentially. This
technique allowed the scientists to “glimpse” the new element for 0.002
seconds.
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