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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

WordNet (r) 3.0 (2006) (WordNet)

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

The Collaborative International Dictionary of English v.0.48 (gcide)

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]

The Elements Database (element)

berkelium
Symbol: Bk
Atomic number: 97
Atomic weight: (247)
Radioactive metallic transuranic element. Belongs to actinoid series.
Eight known isotopes, the most common Bk-247, has a half-life of
1.4*10^3 years. First produced by Glenn T. Seaborg and associates in
1949
by bombarding americium-241 with alpha particles.

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