Atomic Properties
- Atomic Number
- 17
- Atomic Mass
- 35.4500 u
- Electron Configuration
- [Ne] 3s2 3p5
- Electronegativity
- 3.16
- Block
- p-block
- Group
- 17
- Period
- 3
Physical Properties
- Phase (STP)
- gas
- Melting Point
- 171.60 K
- Boiling Point
- 239.11 K
- Density
- 0.0032 g/cm³
About Chlorine
Yellow-green toxic gas; used to disinfect water and make PVC.
Isotopes of Chlorine
Chlorine has 2 naturally occurring isotopes.
| Isotope | Mass Number | Atomic Mass (u) | Abundance | Type |
|---|---|---|---|---|
| 35Cl | 35 | 34.96885268 | 75.76% | Stable |
| 37Cl | 37 | 36.9659026 | 24.24% | Stable |
Data source: NIH PubChem (aggregated from IUPAC, NIST)