Plantilya:Infobox chlorine

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Chlorine
17Cl
F

Cl

Br
sulfurchlorineargon
Appearance
pale yellow-green gas
General properties
Name, simbolo, kaiphan chlorine, Cl, 17
Pronunciation Plantilya:IPAc-en Plantilya:Respell
or Plantilya:IPAc-en Plantilya:Respell
Element category halogen
Group, period, block 173, p
Standard atomic weight 35.45(1)
Electron configuration [Ne] 3s2 3p5
2, 8, 7
Electron shells of chlorine (2, 8, 7)
History
Discovery Carl Wilhelm Scheele (1774)
First isolation Carl Wilhelm Scheele (1774)
Recognized as an element by Humphry Davy (1808)
Physical properties
Phase gas
Density (0 °C, 101.325 kPa)
3.2 g/L
Liquid density at b.p. 1.5625[1] 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
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
Molar heat capacity (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
Oxidation states 7, 6, 5, 4, 3, 2, 1, -1
(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
Covalent radius 102±4 pm
Van der Waals radius 175 pm
Miscellanea
Crystal structure orthorhombic
Chlorine has a orthorhombic crystal structure
Magnetic ordering diamagnetic[2]
Electrical resistivity (20 °C) > 10 Ω·m
Thermal conductivity 8.9Plantilya:E  W·m−1·K−1
Speed of sound (gas, 0 °C) 206 m·s−1
CAS registry number 7782-50-5
Most stable isotopes
Main article: Isotopes of chlorine
iso NA half-life DM DE (MeV) DP
35Cl 75.77% 35Cl is stable with 18 neutrons
36Cl trace 3.01×105 y β 0.709 36Ar
ε - 36S
37Cl 24.23% 37Cl is stable with 20 neutrons
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