Template:Infobox chlorine

<tr><td>Chemical series</td><td>halogens</td></tr> <tr><td>Appearance</td><td>yellowish green
<tr><td>Atomic radius</td><td>100pm</td></tr><tr><td>Atomic radius (calc.)</td><td>79 pm</td></tr><tr><td>Covalent radius</td><td>99 pm</td></tr><tr><td>Van der Waals radius</td><td>175 pm</td></tr> <tr><td rowspan="1" valign="top">Magnetic ordering</td><td>nonmagnetic</td></tr><tr><td>Electrical resistivity</td><td>(20 °C) > 10Ω·m</td></tr><tr><td>Thermal conductivity</td><td>(300 K) 8.9 m W·m⁻¹·K⁻¹</td></tr><tr><td>Speed of sound</td><td>(gas, 0 °C) 206 m/s</td></tr><tr><td>CAS registry number</td><td>7782-50-5</td></tr>

17 sulfur ← chlorine → argon F ↑ Cl ↓ Br Periodic table - Extended periodic table
General
Name, symbol, number	chlorine, Cl, 17
Group, period, block	17, 3, p
Standard atomic weight	35.453(2) g·mol−1
Electron configuration	[Ne] 3s2 3p5
Electrons per shell	2, 8, 7
Physical properties<tr><td>Phase</td><td>gas</td></tr><tr><td>Density</td><td>(0 °C, 101.325 kPa) 3.2 g/L</td></tr><tr><td>Melting point</td><td>171.6 K (-101.5 °C, -150.7 °F)</td></tr><tr><td>Boiling point</td><td>239.11 K (-34.04 °C, -29.27 °F)</td></tr><tr><td>Critical point</td><td>416.9 K, 7.991 MPa</td></tr><tr><td>Heat of fusion</td><td>(Cl2) 6.406 kJ·mol−1</td></tr><tr><td>Heat of vaporization</td><td>(Cl2) 20.41 kJ·mol−1</td></tr><tr><td>Heat capacity</td><td>(25 °C) (Cl2) 33.949 J·mol−1·K−1</td></tr>
Vapor pressure P/Pa 1 10 100 1 k 10 k 100 k at T/K 128 139 153 170 197 239
Atomic properties <tr><td>Crystal structure</td><td>orthorhombic</td></tr><tr><td>Oxidation states</td><td>±1, 3, 5, 7 (strongly acidic oxide)</td></tr><tr><td>Electronegativity</td><td>3.16 (Pauling scale)</td></tr>
Ionization energies (more)	1st: 1251.2 kJ·mol−1
	2nd: 2298 kJ·mol−1
	3rd: 3822 kJ·mol−1
Miscellaneous
Selected isotopes
Main article: Isotopes of chlorine iso NA half-life DM DE (MeV) DP 35Cl 75.77% Cl is stable with 18 neutrons 36Cl syn 301×103 y β- 0.709 36Ar ε - 36S 37Cl 24.23% Cl is stable with 20 neutrons
References