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Berkelium • Actinide Rare Earth
Symbol: Bk
Date of discovery: 1949
Name origin: Berkeley, CA
Appearance: unknown
Discoverer: G.T. Seaborg
Obtained from: man-made
Melting point: 1259 K
Boiling point: unknown
Density[kg/m3]: 14780
Molar volume: 16.84 × 10-6 m3/mol
Protons/Electrons: 97
Neutrons: 150
Shell structure: 2,8,18,32,27,8,2
Electron configuration: [Rn]5f97s2
Oxidation state: 3,4
Crystal structure: hexagonal
This radioactive metallic element was created by bombarding americium with alpha particles. The fifth transuranic element to be synthesized, berkelium was discovered late in 1949 by Glenn T. Seaborg, Stanley G. Thompson, and Albert Ghiorso, who produced it by bombarding americium-241 with alpha particles in the cyclotron of the University of California, Berkeley. Berkelium metal is chemically reactive, exists in two crystal modifications, and melts at 986K. Like other actinides, berkelium accumulates in skeletal tissue. Outside of basic research, this element has no known uses.
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