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Definition of: berkelium
(bûrk′lē·əm) noun
A very rare, unstable element (symbol Bk, atomic number 97) of the actinide series, first obtained by bombarding americium with alpha particles, the most stable isotope having mass number 247 and a half-life of 1400 years. See PERIODIC TABLE. [from Berkeley, California, location of the University of California, where first produced]
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