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Berkelium  SEE PERIODIC TABLE
see article  SEE FULL ARTICLE

Atomic Number97
Atomic SymbolBk
Atomic Weight[247 amu]
GroupRare Earth (Actinide Series)
FormSolid
Density @ STP13.25 g/cm3
Melting Point986 °C (1806.8 °F, 1259.15 °K)
First Ionization Potential6.23 eV
Ground State Electron Configuration5f9 6s2 6p6 6f2
Oxidation State(s)+3, +4
Selected Radioisotopes249Bk
Crystal StructureHexagonal
Discovered byThompson; Ghiorso; Seaborg, 1949