17 Cl
Halogen
Chlorine
Disinfects water; in table salt.
Properties of Chlorine
- Atomic number (Z)
- 17
- Symbol
- Cl
- Atomic mass
- 35.45 g/mol
- Category
- Halogen
- Group
- 17
- Period
- 3
- Electron configuration
- [Ne] 3s² 3p⁵
- Electronegativity (Pauling)
- 3.16
- Atomic radius
- 79 pm
- First ionization energy
- 1251 kJ/mol
- Melting point
- 171.6 K (-101.5 °C)
- Boiling point
- 239.11 K (-34.0 °C)
- Density
- 0.003214 g/cm³
- Phase at 25 °C
- Gas
- Discovered
- Discovered in 1774
Frequently asked questions
What is Chlorine?
Chlorine (Cl) is a halogen, element number 17 on the periodic table. Disinfects water; in table salt.
What is the atomic number and atomic mass of Chlorine?
Chlorine has atomic number 17 and an atomic mass of about 35.45 g/mol.
What is the electron configuration of Chlorine?
The electron configuration of Chlorine is [Ne] 3s² 3p⁵.
Where is Chlorine on the periodic table?
Chlorine sits in group 17, period 3, and is classified as a halogen.