Template:infobox_chlorine

17 sulfur ← chlorine → argon F ↑ Cl ↓ Br Periodic table - Extended periodic table
General
Name, symbol, number	chlorine, Cl, 17
Chemical series	nonmetals
Group, period, block	17, 3, p
Appearance	yellowish green
Standard atomic weight	35.453(2) g·mol−1
Electron configuration	[Ne] 3s2 3p5
Electrons per shell	2, 8, 7
Physical properties
Phase	gas
Density	(0 °C, 101.325 kPa) 3.2 g/L
Melting point	171.6 K (-101.5 °C, -150.7 °F)
Boiling point	239.11 K (-34.4 °C, -29.27 °F)
Critical point	416.9 K, 7.991 MPa
Heat of fusion	(Cl2) 6.406 kJ·mol−1
Heat of vaporization	(Cl2) 20.41 kJ·mol−1
Heat capacity	(25 °C) (Cl2) 33.949 J·mol−1·K−1
Vapor pressure P/Pa 1 10 100 1 k 10 k 100 k at T/K 128 139 153 170 197 239
Atomic properties
Crystal structure	orthorhombic
Oxidation states	±1, 3, 5, 7 (strongly acidic oxide)
Electronegativity	3.16 (Pauling scale)
Ionization energies (more)	1st: 1251.2 kJ·mol−1
	2nd: 2298 kJ·mol−1
	3rd: 3822 kJ·mol−1
Atomic radius	100 pm
Atomic radius (calc.)	79 pm
Covalent radius	99 pm
Van der Waals radius	175 pm
Miscellaneous
Magnetic ordering	nonmagnetic
Electrical resistivity	(20 °C) > 10 Ω·m
Thermal conductivity	(300 K) 8.9x10-3  W·m−1·K−1
Speed of sound	(gas, 0 °C) 206 m/s
CAS registry number	7782-50-5
Selected isotopes
Main article: Isotopes of chlorine iso NA half-life DM DE (MeV) DP 35Cl 75.77% 35Cl is stable with 18 neutrons 36Cl syn 3.01×105 y β- 0.709 36Ar ε - 36S 37Cl 24.23% 37Cl is stable with 20 neutrons
References
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