53 I 126.904
Iodine
diatomic nonmetal
Properties
- Atomic number
- 53
- Atomic mass
- 126.904 u
- Category
- diatomic nonmetal
- Group
- 17
- Period
- 5
- Block
- p-block
- State (room temp)
- Solid
- Outer-shell electrons
- 7
- Electronegativity
- 2.66 (Pauling)
- Density
- 4.933 g/cm³
- Melting point
- 113.7 °C
- Boiling point
- 184.25 °C
Electron configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁵
Noble-gas shorthand: [Kr] 4d¹⁰ 5s² 5p⁵
Electrons per shell: 2, 8, 18, 18, 7 — that's 7 in the outermost shell.
About 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.
- Discovered by Bernard Courtois
- Appearance: lustrous metallic gray, violet as a gas
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.