Technical data for Chlorine

Overview
NameChlorine
SymbolCl
Atomic Number17
Atomic Weight35.453
Density3.214 g/l[note]
Melting Point-101.5 °C
Boiling Point-34.04 °C

Thermal properties
PhaseGas
Melting Point-101.5 °C
Boiling Point-34.04 °C
Absolute Melting Point171.6 K
Absolute Boiling Point239.11 K
Critical Presure7.991 MPa (78.87 Atm)
Critical Temperature416.9 K
Heat of Fusion3.2 kJ/mol
Heat of Vaporization10.2 kJ/mol
Heat of CombustionN/A
Specific Heat478.2 J/(kg K)[note]
Adiabatic Index7/5
Thermal Conductivity0.0089 W/(m K)
Thermal ExpansionN/A

Bulk physical properties
Density3.214 g/l[note]
Density (Liquid)N/A
Molar Volume0.011031
Vickers HardnessN/A
Bulk Modulus1.1 GPa
Refractive Index1.000773
Speed of Sound206 m/s
Thermal Conductivity0.0089 W/(m K)
Thermal ExpansionN/A

Reactivity
Valence5
Electronegativity3.16
ElectronAffinity349 kJ/mol
Ionization Energies
1251.2, 2298, 3822, 5158.6, 6542, 9362, 11018, 33604, 3.86×104, 43961 kJ/mol

Health and Safety
Autoignition PointN/A
FlashpointN/A

Classifications
Alternate NamesNone
Nams of AllotropesDichlorine
Blockp
Group17
Period3
Electron Configuration[Ne]3s23p5
ColorYellow
Discovery
1774 in Sweden
Gas phaseDiatomic
CAS NumberCAS7782-50-5

Electrical properties
Electrical TypeInsulator
Electrical Conductivity0.01 S/m
Resistivity100 m Ω
Superconducting PointN/A

Magnetic properties
Magnetic TypeDiamagnetic
Curie PointN/A
Mass Magnetic Susceptibility-7.2×10-9
Molar Magnetic Susceptibility-2.55×10-10
Volume Magnetic Susceptibility-2.31×10-8

Abundances
% in Universe0.0001%
% in Sun0.0008%
% in Meteorites0.037%
% in Earth's Crust0.017%
% in Oceans2%
% in Humans0.12%

Atomic dimensions and structure
Atomic Radius79 pm
Covalent Radius99 pm
Van der Waals Radius175 pm
Crystal StructureBase Centered Orthorhombic
Lattice Angles
π/2, π/2, π/2
Lattice Constants
622.35, 445.61, 817.85 pm
Space Group NameCmca
Space Group Number64

Nuclear Properties
Half-LifeStable
LifetimeStable
Stable Isotopes
35Cl, 37Cl
Isotopic Abundances
35Cl75.78%
37Cl24.22%

Notes on the properties of Chlorine:
Density: Density given for Cl at 0° Celsius. 2
Specific Heat: gas (Cl ) 2