- noun a synthetic radioactive element in the actinide series of the periodic table produced by bombardment of americium-241 with helium ions
- A synthetic radioactive element whose atomic number is 97. It has over 10 identified isotopes, all of which are unstable. The procedures utilized to create it are employed to better understand the synthesis of other transuranium elements. Its chemical symbol is Bk.
- chemical symbolBk
- noun a second in command of a battery