Atomic Properties
- Atomic Number
- 53
- Atomic Mass
- 126.9000 u
- Electron Configuration
- [Kr] 4d10 5s2 5p5
- Electronegativity
- 2.66
- Block
- p-block
- Group
- 17
- Period
- 5
Physical Properties
- Phase (STP)
- solid
- Melting Point
- 386.85 K
- Boiling Point
- 457.40 K
- Density
- 4.9330 g/cm³
About Iodine
Essential for thyroid hormones; used as antiseptic and in photography.
Isotopes of Iodine
Iodine has 1 naturally occurring isotope.
| Isotope | Mass Number | Atomic Mass (u) | Abundance | Type |
|---|---|---|---|---|
| 127I | 127 | 126.9044719 | 100.00% | Stable |
Data source: NIH PubChem (aggregated from IUPAC, NIST)