Name Berkelium
Symbol Bk
Atomic Number 97
Atomic Mass 247 atomic mass units
Number of Protons 97
Number of Neutrons 150
Number of Electrons 97
Melting Point unknown
Boiling Point unknown
Density unknown
Normal Phase Synthetic
Family Rare Earth Metals
Period 7
Cost unavailable



Origin of Name From the city Berkeley, California
Date of Discovery 1949 at the University of California
Discovered by Glen Theodore Seaborg, Stanley G. Thompson,  Kenneth Street, Jr., and Albert Ghiorso
Common Compounds
  • Berkelium bromide (BkBr3)
  • Berkelium chloride (BkCl3)
  • Berkelium fluoride (BkF3)
  • Berkelium iodide (BkI3)
  • Berkelium oxide (BkO)
Interesting facts
  • X-ray diffraction techniques have been used to identify certain berkelium compounds.
  • Berkelium bio-accumulates in skeletal tissue.
  • Toxic due to its radioactivity.
Common Uses
  • It is extremely rare and has no technological biological, or commercial use.


Photo Courtesy of
British Columbia Institute of Technology
Chemsoc Chemical Elements
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