Astronomy · Chemical element
Chlorine
Chlorine (Cl) is a chemical element belonging to the category Halogen, with atomic number 17 and atomic mass 35.4500 u. This sheet describes its fundamental properties, periodic position and physical characteristics.
Identity
- Name: Chlorine
- Symbol: Cl
- Atomic number: 17
- Atomic mass: 35.4500 u
Position in the periodic table
- Group: 17
- Period: 3
- Category: Halogen
Physico-chemical properties
- Standard state: Gas
- Melting point: -101°C
- Density (gas at 0°C and 1 atm): 0.0032 g/cm³
- Electron configuration: [Ne] 3s² 3p⁵
Scientific description
Chlorine is a chemical element with symbol Cl and atomic number 17. It belongs to the category of halogens and occupies group 17 and period 3. Its standard atomic mass is 35.4500 u.