Element: Barium (Ba)

Element (Atom) NameBarium
Physical state at room temperatureSolid
Element ClassificationMetal
Group NameAlkaline Earth Metal
Period Number (Periodic table) 6
Group number (Periodic table)2
Atomic number56
Atomic weight137.327 (Ref: Jlab-ele056, Ciaaw-barium, Nist-56)
137.3 (Ref: Lanl-56)
Atomic Radius268 pm (Van der Waals) (Ref: Lanl-56)
Density3.62 g/cm3 (Ref: Jlab-ele056)
Melting point727°C (Ref: Jlab-ele056, Lanl-56)
Boiling point1897°C (Ref: Jlab-ele056)
1845 °C (Ref: Lanl-56)
Electron shell configuration1s2 
2s2 2p6 
3s2 3p6 3d10 
4s2 4p6 4d10 
5s2 5p6
Oxidation States+2 (Ref: Jlab-ele056)
+2, +1 ​(a strongly basic oxide) (REF: Lanl-56)
Ionization Energy5.212 eV (Ref: Jlab-ele056)
5.2116646  eV (Ref: Nist-56)
Number of Stable Isotopes6
InChI1S/Ba (Pubchem-56)


  • Jlab-ele056: https://education.jlab.org/itselemental/ele056.html
  • Lanl-56: https://periodic.lanl.gov/56.shtml
  • Ciaaw-barium: https://www.ciaaw.org/barium.htm
  • Nist-56 : https://physics.nist.gov/cgi-bin/Elements/elInfo.pl?element=56
  • Pubchem-56: https://pubchem.ncbi.nlm.nih.gov/element/56
  • science.co.il: https://www.science.co.il/elements/

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