Element: Iodine (I)

Element (Atom) NameIodine
Physical state at room temperatureSolid
Element ClassificationNon-metal
Group NameHalogen
Period Number (Periodic table) 5
Group number (Periodic table)17
Atomic number53
Atomic weight126.90447 (Ref: Jlab-ele053, Ciaaw-iodine, Nist-53)
126.9 (Ref: Lanl-53)
Atomic Radius198 pm (Van der Waals) (Ref: Lanl-53)
Density4.93 g/cm3 (Ref: Jlab-ele053)
Melting point113.7°C (Ref: Jlab-ele053, Lanl-53)
Boiling point184.4°C (Ref: Jlab-ele053)
184.3 °C (Ref: Lanl-53)
Electron shell configuration1s2 
2s2 2p6 
3s2 3p6 3d10 
4s2 4p6 4d10 
5s2 5p5
Oxidation States+7, +5, +1, -1 (Ref: Jlab-ele053)
7, 6, 5, 4, 3, 1, −1 ​(a strongly acidic oxide) (Ref: Lanl-53)
Ionization Energy10.451 eV (Ref: Jlab-ele053)
10.451260 eV (Ref: Nist-53
Number of Stable Isotopes1
InChIInChI=1S/I (Ref: Pubchem-53)


  • Jlab-ele053: https://education.jlab.org/itselemental/ele053.html
  • Lanl-53: https://periodic.lanl.gov/53.shtml
  • Ciaaw-iodine : https://www.ciaaw.org/iodine.htm
  • Nist-53 : https://physics.nist.gov/cgi-bin/Elements/elInfo.pl?element=53
  • Pubchem-53: https://pubchem.ncbi.nlm.nih.gov/element/53
  • science.co.il: https://www.science.co.il/elements/

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