iodine

Symbol: I
Atomic number: 53
Atomic weight: 126.90447
Group: 17
Group name: Halogen
Period: 5
Block: p
CAS ID: 7553-56-2
Shell structure: 2.8.18.18.7
Electron configuration: [Kr].4d10.5s2.5p5
State: |standardstate|
Melting point: 386.85 [or 113.7 °C (236.66 °F)]
Boiling point: 457.4 [or 184.3 °C (363.7 °F)]
Ionization energy/kJ per mol: 1008.4
Common oxidation states: 7, 5, 3, 1, and -1
Pauling electronegativity: 2.66