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berkelium    
n. 放射性元素,符号Bk,原子序为98

放射性元素,符号Bk,原子序为98

berkelium
n 1: a radioactive transuranic element; discovered by bombarding
americium with helium [synonym: {berkelium}, {Bk}, {atomic
number 97}]

berkelium \ber*ke"li*um\ (b[~e]r*k[=e]"l[-e]*[u^]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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