Element: Erbium (Er)

Element (Atom) NameErbium
SymbolEr
Physical state at room temperatureSolid
Element ClassificationMetal
Group NameLanthanide
Period Number (Periodic table) 6
Group number (Periodic table)None
Atomic number68
Atomic weight167.259 (Ref: Jlab-ele068, ciaaw-erbium, Nist-68)
167.3 (Ref: Lanl-68)
Atomic Radius235 pm (Van der Waals)
Density9.07 g/cm3 (Ref: Jlab-ele068)
Melting point1529°C (Ref: Jlab-ele068, Lanl-68)
Boiling point2868°C (Ref: Jlab-ele068, Lanl-68)
Electron shell configuration1s2 
2s2 2p6 
3s2 3p6 3d10 
4s2 4p6 4d10 4f12 
5s2 5p6 
6s2 
Oxidation States+3 (Ref: Jlab-ele068)
3, 2, 1 ​(a basic oxide) (Ref: Lanl-68)
Ionization Energy6.108 eV (Ref: Jlab-ele068)
6.1077 eV (Ref: Nist-68)
Number of Stable Isotopes6
InChIInChI=1S/Er (Ref: Pubchem-68)
InChI KeyUYAHIZSMUZPPFV-UHFFFAOYSA-N (Ref: Pubchem-68)
Remarks 

REFERENCES

  • Jlab-ele068: https://education.jlab.org/itselemental/ele068.html
  • Lanl-68: https://periodic.lanl.gov/68.shtml
  • ciaaw-erbium : https://www.ciaaw.org/erbium.htm
  • Nist-68: https://physics.nist.gov/cgi-bin/Elements/elInfo.pl?element=68
  • Pubchem-68: https://pubchem.ncbi.nlm.nih.gov/element/68
  • science.co.il: https://www.science.co.il/elements/

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