Home 53 I Iodine back to the periodic table

Atomic number   53
Symbol   I
Atomic weight   126.90447
Density [g/cm3]   4.94
Melting point [°C]   113.5
Boiling point [°C]   184.4
1st Ionization energy [eV]   10.451
Electronic configuration   [Kr] 4d10 5s2 5p5
Oxidation number (most stable)   7, 5, 1, 1-
Atomic radius [pm]   133.1
Ionic radius [pm]   216 (1-)
Abundance in crustal rocks [ppm]   0.46
Origin of the name   (greek) ioeides = violet (due to violett vapour, which iodine forms at room temperature)
Discovery   1782 by Müller von Reichenstein
Uses   Disinfecting in the medicine as well as for photo-technical chemicals.

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© 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
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