Element: Berkelium (Bk)

Element (Atom) NameBerkelium
Physical state at room temperatureSolid
Element ClassificationMetal
Group NameActinide
Period Number (Periodic table) 7
Group number (Periodic table)None
Atomic number97
Atomic weight247 (Ref: Jlab-ele097, Lanl-97)
Atomic Radius244 pm (Van der Waals) (Ref: Lanl-97)
Density14  g/cm3 (Ref: Jlab-ele097)
Melting point1050°C (Ref: Jlab-ele097)
986 °C (Ref: Lanl-97)
Boiling point2627 °C (Ref: Lanl-97)
Electron shell configuration1s2 
2s2 2p6 
3s2 3p6 3d10 
4s2 4p6 4d10 4f14 
5s2 5p6 5d10 5f9
6s2 6p6 
Oxidation States+4, +3 (Ref: Jlab-ele097)
2, 3, 4 (Ref: Lanl-97)
Ionization Energy6.23 eV (Ref: Jlab-ele097)
6.19785 eV (Ref: Nist-97)
Number of Stable Isotopes0
InChIInChI=1S/Bk (Ref: Pubchem-97)
RemarksRadioactive, Artificially Produced (Ref: Jlab-ele097)


  • Jlab-ele097: https://education.jlab.org/itselemental/ele097.html
  • Lanl-97: https://periodic.lanl.gov/97.shtml
  • ciaaw-atomic-weights: https://www.ciaaw.org/atomic-weights.htm
  • Nist-97: https://physics.nist.gov/cgi-bin/Elements/elInfo.pl?element=97
  • Pubchem-97: https://pubchem.ncbi.nlm.nih.gov/element/97
  • science.co.il: https://www.science.co.il/elements/

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