53Solid
I 126.904 Atomic mass · uHalogens
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.
Discovery 1811 (Bernard Courtois)
K2L8M18N18O7
Physical properties
Values for the element in its standard state.
- Density
- 4.94g/cm³
- Melting point
- 387K
- Boiling point
- 457K
- Atomic radius
- 133pm
- Bonding type
- Covalent network
- Molar heat
- Not available
Inside the atom
Electron arrangement and the energy behind its behavior.
Full electron configuration
1s, 2 electrons; 2s, 2 electrons; 2p, 6 electrons; 3s, 2 electrons; 3p, 6 electrons; 3d, 10 electrons; 4s, 2 electrons; 4p, 6 electrons; 4d, 10 electrons; 5s, 2 electrons; 5p, 5 electrons;
[Kr] represents 36 core electrons. The full view shows them explicitly.
53 electrons Orbital order preserved from source
- Electronegativity
- 2.66Pauling scale
- First ionization energy
- 1,008kJ/mol
- Electron affinity
- 295kJ/mol
- Van der Waals radius
- 198pm
I IodineAtomic number 53
1,008kJ/mol
Atomic numberGaps indicate unavailable data
About iodine
- Appearance
- Lustrous metallic gray, violet as a gas
- Discovery
- 1811 (Bernard Courtois)
- Data source
- Read the reference
A missing value means it is unavailable in this reference dataset. Values can vary with measurement method and conditions.