Electronic data		Thermal data		Steric data
Shells: 2,8,7 Orbitals: [Ne] 3s2 3p5 Electronegativity: 2.8, 3.0 1. Ionization potential: 12.9676 eV 2. Ionization potential: 23.81 eV 3. Ionization potential: 39.611 eV Oxidation states: 7,5,3,1,-1 Electrical conductivity: --		Melting point: -100.98 °C Boiling point: -34.6 °C Specific heat: 0.48 J/gK Heat of fusion: 3.203 kJ/mol Heat of vaporization: 10.20 kJ/mol Thermal conductivity: 0.000089 W/cmK		Atomic radius: 0.97 Å Ionic radius: 1.81 Å () Covalent radius: 0.99 Å Atomic volume: 16.9 cm³/mol Density (293 K): 0.003214 g/cm³ Crystal structure: Orthorhombic

Nuclide	Abundance [%]	Mass	Spin	Halflife	Decay mode	Decay tree
35Cl	75.53	34.9689	3/2	--	stable	--
36Cl	0	35.9797	2	3.01E05y	-,EC,+	View
37Cl	24.47	36.9659	3/2	--	stable	--
38Cl	0	38	2	37.2m	-	View

Legend

Name origin:	Greek: chlôros (greenish yellow)
Description:	Greenish-yellow, disagreeable gas. Never found in free form in nature.
Discovered by:	Carl Wilhelm Scheele
Year:	1774
Place:	Sweden
Sources:	Salt (sodium chloride, NaCl) is its most common compound. Commercial quantities are produced by electrolysis of aqueous sodium chloride (seawater or brine from salt mines).
Use(s):	Used in water purification, bleaches, acids and many, many other compounds such as chlorofluorocarbons (CFC).