- Atomic Radius (Å)
Iodine is a chemical element with symbol I and atomic number 53. The name is from Greek ἰοειδής ioeidēs, meaning violet or purple, due to the color of iodine vapor. Iodine and its compounds are primarily used in nutrition, and industrially in the production of acetic acid and certain polymers.
53 Atomic Number
126.9 u Atomic Mass
386.65 K Melting Point
457.4 K Boiling Point
4.93 g/cm³ Density
1.3 Å Atomic Radius
1.39 Å Covalent Radius
2.66 Electronegativity
10.45 eV First Ionization Energy
295.15 Electron Affinity
5 Number of Shells
7 Electron Valency
2, 8, 18, 18, 7 Electron Shell Occupations
0.21 J/g Specific Heat