Baseball.
- balk.
Symbol, Chemistry.
abbreviation for
- bank
- book
the chemical symbol for
- berkelium
- The symbol for the elementberkelium
- The symbol for berkelium.
Bk
- A synthetic, radioactive metallic element of the actinide series that is produced from americium, curium, or plutonium. Its most stable isotope has a half-life of about 1,400 years. Atomic number 97; melting point 986°C; valence 3, 4. See Periodic Table.