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53 - Iodine diatomic nonmetal

Discovered by Bernard Courtois in 1811

Iodine

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.
Shell Electrons Orbitals
1 2 2 in 1s
2 8 2 in 2s + 6 in 2p
3 18 2 in 3s + 6 in 3p + 10 in 3d
4 18 2 in 4s + 6 in 4p + 10 in 4d
5 7 2 in 5s + 5 in 5p
IodineI Electron 1 Electron 2 Electron 1 Electron 2 Electron 3 Electron 4 Electron 5 Electron 6 Electron 7 Electron 8 Electron 1 Electron 2 Electron 3 Electron 4 Electron 5 Electron 6 Electron 7 Electron 8 Electron 9 Electron 10 Electron 11 Electron 12 Electron 13 Electron 14 Electron 15 Electron 16 Electron 17 Electron 18 Electron 1 Electron 2 Electron 3 Electron 4 Electron 5 Electron 6 Electron 7 Electron 8 Electron 9 Electron 10 Electron 11 Electron 12 Electron 13 Electron 14 Electron 15 Electron 16 Electron 17 Electron 18 Electron 1 Electron 2 Electron 3 Electron 4 Electron 5 Electron 6 Electron 7
126.9  u Atomic Mass
1.3  Å Atomic Radius
457.4  K Boiling Point
1.39  Å Covalent Radius
4.93  g/cm³ Density
295.15 Electron Affinity
2.66 Electronegativity
10.45  eV First Ionization Energy
386.65  K Melting Point
5 Number of Shells
7 Electron Valency
53 Atomic Number
2, 8, 18, 18, 7 Electron Shell Occupations
0.21  J/(g K) Specific Heat