← Back to periodic table
Iodine (I)
Atomic number: 53 · Category: diatomic nonmetal · Group 17 · Period 5 · Phase: Solid
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.
Atomic mass: 126.904473
Density: 4.933
Melting point: 386.85 K
Boiling point: 457.4 K
Appearance: lustrous metallic gray, violet as a gas
Source: Wikipedia
Block: p
CPK color:#940094
Electronic structure
Electron configuration: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p5
Configuration (semantic): [Kr] 4d10 5s2 5p5
Shells: 2, 8, 18, 18, 7
Electronegativity (Pauling): 2.66
Electron affinity: 295.1531
Ionization energies: 1008.4, 1845.9, 3180
Periodic position
Group: 17
Period: 5
xpos: 17
ypos: 5
Spectral/Bohr images
Image
3D Model