Periodic Table of Elements

17

Chlorine

32.06

Chlorine was discovered by a Swedish scientist, Carl Willam Scheele in 1774.

Name: chlorine
Symbol: Cl
Atomic number: 17
Atomic weight: 35.45
State: gas
Group, period, block: 17, 3, p
Color: pale yellow-green gas
Classification: halogen
Electron configuration: 3s2 3p5
2,8,7

Physical properties

Density @293 K:: 3.214 g/cm-3
Melting point: 171.6 K, -101.5 C, -150.7 F
Boiling point: 239.11 K, -34.04 C, -29.27 F

Atomic properties

Oxidation states: 7, 6, 5, 4, 3, 2, 1, -1
Electronegativity: 3.16 (Pauling scale)
Ionization energies: 1st: 1251.2 kJmol-1
Covalent radius: 1024 pm
Van der Waals radius: 175 pm
  • Cl
  • Electron Configuration

Isotopes

There are two naturally occurring isotopes of chlorine exist, 35Cl, and 37Cl. 35Cl has a mass of 34.9689 amu with a natural abundance of 75.77%. 37Cl has a mass of 36.9659 amu with a natural abundance of 24.23%. Together they give chlorine an atomic weight of 35.4527 g/mol.