ber*ke"li*um(br*k"l*m), n. [from the city of Berkeley, California, location of the University of California campus where it was discovered.] a chemical element of the transuranic series. Chemical symbol Bk; atomic number 97; atomic weight 247. It is a radioactive element, with no stable isotopes; the longest-lived isotope is of mass number 247.07, decaying by alpha-emission with a half-life of 1,400 years. The isotope with atomic weight 249 has a half-life of 314 days, and was isolated in weighable quantities.
Syn. -- Bk.
[WordNet 1.5 +PJC]
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