a radioactive transuranic element; discovered by bombarding americium with helium 同义词:Bk, atomic number 97,
Berkelium is a transuranic radioactive chemical element with the symbol Bk and atomic number 97, a member of the actinide and transuranium element series. It is named after the city of Berkeley, California, the location of the University of California Radiation Laboratory where it was discovered in December 1949.