bohrium [Bh]

Named after Danish physicist Neils Bohr. Discovered in 1976 at the Joint Institute for Nuclear Research (JINR) in Dubna, Russia. Confirmed in 1981 by German physicists Peter Armbruster & Goddfried Muzenberg at the Gesellshaft fur Schwerionenforschung. Occurrence: 1) borium-262 was artificially produced by fusion of bismuth-209 & chromium-54 2) about 70 atoms of bohrium-262 have been produced Characteristics: 1) highly radioactive 2) 5 isotopes known 261, 262, 264, 266 & 267 3) all isotopes emit alpha particles 4) bohrium-262 with the shortest 1/2life of 112 milliseconds; bohrium-267 with the longest 1/2life of 17 seconds Uses: none

General

transactinide radioactive element

Properties

SIZE: AW = 264 atomic number VALUE: 107

References

Eichler et al. Nature 407:63-65, 2000 Chemical & Engineering News, Sept 8, 2003