Element: Promethium (Pm)

Element (Atom) NamePromethium
Physical state at room temperatureSolid
Element ClassificationMetal
Group NameLanthanide
Period Number (Periodic table) 6
Group number (Periodic table)None
Atomic number61
Atomic weight145 (Ref: Jlab-ele061, Lanl-61, Nist-61)
Atomic Radius236 pm (Van der Waals) (Ref: Lanl-61)
Density7.26 g/cm3.. (Ref: Jlab-ele061)
Melting point1042°C (Ref: Jlab-ele061, Lanl-61)
Boiling point3000°C (Ref: Jlab-ele061, Lanl-61)
Electron shell configuration1s2 
2s2 2p6 
3s2 3p6 3d10 
4s2 4p6 4d10 4f5 
5s2 5p6 
Oxidation States+3 (Ref: Jlab-ele061)
3, 2 ​(a mildly basic oxide) (Ref: Lanl-61)
Ionization Energy5.55 eV (Ref: Jlab-ele061)
5.58187 eV (Ref: Nist-61)
Number of Stable Isotopes0
InChIInChI=1S/Pm (Ref: Pubchem-61)
RemarksRadioactive and Artificially Produced (Ref: Jlab-ele061)


  • Jlab-ele061: https://education.jlab.org/itselemental/ele061.html
  • Lanl-61: https://periodic.lanl.gov/61.shtml
  • ciaaw: https://www.ciaaw.org/atomic-weights.htm
  • Nist-61: https://physics.nist.gov/cgi-bin/Elements/elInfo.pl?element=61
  • Pubchem-61: https://pubchem.ncbi.nlm.nih.gov/element/61
  • science.co.il: https://www.science.co.il/elements/

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