bk

Baseball.

1. balk.

Symbol, Chemistry.

1. berkelium.

1. bank.
2. book.

abbreviation for

1. bank
2. book

the chemical symbol for

1. berkelium

1. The symbol for the elementberkelium

1. The symbol for berkelium.

Bk

1. 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.