A synthetic transuranic radioactive element having isotopes with mass numbers from 235 to 254. Its longest-lived isotopes, Bk-247 and Bk-248, have half-lives of 1,380 years and more than 9 years, respectively; the isotope produced in greatest quantity, Bk-249, has a half-life of 330 days. Atomic number 97; melting point 996°C; specific gravity 14 (estimated); valence 3, 4.
A radioactive, metallic chemical element, one of the actinides, initially produced by bombarding americium with high-energy alpha particles in a cyclotron, and now prepared by intense neutron bombardment of plutonium: symbol, Bk; at. no. 97
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.
Origin of berkelium
- After Berkeley California
From American Heritage Dictionary of the English Language, 5th Edition
- After Berkeley, California, because of discovery at UC Berkeley.