Bk is a chemical element with the symbol Bk and atomic number 97. It is a member of the actinide series and is classified as a radioactive metal. Discovered in 1949, Bk is named after the city of Berkeley, California, where it was first synthesized. It is primarily produced in nuclear reactors and has limited applications due to its radioactivity. Bk is not found naturally in significant amounts and is typically created through the bombardment of plutonium or uranium with neutrons. Its isotopes are used in scientific research, particularly in studies related to nuclear chemistry and physics. Due to its radioactivity, handling Bk requires special precautions.