Element: Argon (Ar)

Element (Atom) NameArgon
SymbolAr
Physical state at room temperatureGas
Element ClassificationNon-metal
Group NameNoble Gas
Period Number (Periodic table) 3
Group number (Periodic table)18
Atomic number18
Atomic weight39.948 (Ref: Jlab-ele018, Nist-18)
39.95 (Ref: Lanl-18)
[39.792, 39.963] (Ref: ciaaw-argon)
Atomic Radius188 pm (Van der Waals) (Ref: Lanl-18)
Density0.0017837 g/cm3 (Ref: Jlab-ele018)
Melting point-189.35°C (Ref: Jlab-ele018)
-189.34 °C (Ref: Lanl-18)
Boiling point-185.85°C (Ref: Jlab-ele018)
-185.85 °C (Ref: Lanl-18)
Electron shell configuration1s2 
2s2 2p6 
3s2 3p6
Oxidation States0 (Ref: Jlab-ele018, Lanl-18)
Ionization Energy15.760 eV (Ref: Jlab-ele018)
15.7596119 eV (Ref: Nist-18)
Number of Stable Isotopes3
InChIInChI=1S/Ar (Ref: Pubchem-18)
InChI KeyXKRFYHLGVUSROY-UHFFFAOYSA-N (Ref: Pubchem-18)
Remarks 

REFERENCES

  • Jlab-ele018: https://education.jlab.org/itselemental/ele018.html
  • Lanl-18: https://periodic.lanl.gov/18.shtml
  • ciaaw-argon: https://www.ciaaw.org/argon.htm
  • Nist-18 : https://physics.nist.gov/cgi-bin/Elements/elInfo.pl?element=18
  • Pubchem-18: https://pubchem.ncbi.nlm.nih.gov/element/18
  • science.co.il: https://www.science.co.il/elements/

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