Chlorine

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17

Cl

35.435
Physical Properties
Color greenish-yellow
Phase at Room Temp. gas
Density (g/cm3) 0.0032
Hardness (Mohs) ---
Melting Point (K) 172.22
Boiling Point (K) 239.2
Heat of Fusion (kJ/mol) 6.4
Heat of Vaporization (kJ/mol) 20.4
Heat of Atomization (kJ/mol) 121
Thermal Conductivity (J/m sec K) 0.01
Electrical Conductivity (1/mohm cm) 0
Source Halite, brine (misc)
Atomic Properties
Electron Configuration [Ne]3s23p5
Number of Isotopes 2
Electron Affinity (kJ/mol) 349
First Ionization Energy (kJ/mol) 1251.1
Second Ionization Energy (kJ/mol) 2297.3
Third Ionization Energy (kJ/mol) 3821.8
Electronegativity 3.16
Polarizability (Å3) 2.2
Atomic Weight 35.435
Atomic Volume (cm3/mol) 21.4
Ionic Radius2- (pm) ---
Ionic Radius1- (pm) 167
Atomic Radius (pm) 100
Ionic Radius1+ (pm) ---
Ionic Radius2+ (pm) ---
Ionic Radius3+ (pm) ---
Common Oxidation Numbers -1,+1,+3,+5,+7
Other Oxid. Numbers +2,+4,+6
Abundance
In Earth's Crust (mg/kg) 1.45×102
In Earth's Ocean (mg/L) 1.94×104
In Human Body (%) 0.14%
Regulatory / Health
CAS Number 7782-50-5
OSHA Permissible Exposure Limit (PEL) 1 ppm = 2.9mg/m3
Ceiling: 1 ppm
OSHA PEL Vacated 1989 TWA: 0.5 ppm
STEL: 1 ppm
NIOSH Recommended Exposure Limit (REL) Ceiling: 0.5 ppm
IDLH: 10 ppm
Sources:
University of Wisconsin General Chemistry
Mineral Information Institute
Jefferson Accelerator Laboratory
EnvironmentalChemistry.com
 
Glossary

Citation

(2008). Chlorine. Retrieved from http://www.eoearth.org/view/article/51cbed3a7896bb431f690ac4

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