Technical data for Iodine

Overview
NameIodine
SymbolI
Atomic Number53
Atomic Weight126.90447
Density4.94 g/cm3
Melting Point113.7 °C
Boiling Point184.3 °C

Thermal properties
PhaseSolid
Melting Point113.7 °C
Boiling Point184.3 °C
Absolute Melting Point386.85 K
Absolute Boiling Point457.4 K
Critical Presure11.7 MPa (115.5 Atm)
Critical Temperature819 K
Heat of Fusion7.76 kJ/mol
Heat of Vaporization20.9 kJ/mol
Heat of CombustionN/A
Specific Heat429 J/(kg K)[note]
Thermal Conductivity0.449 W/(m K)
Thermal ExpansionN/A

Bulk physical properties
Density4.94 g/cm3
Density (Liquid)N/A
Molar Volume0.000025689
Bulk Modulus7.7 GPa
Thermal Conductivity0.449 W/(m K)
Thermal ExpansionN/A

Reactivity
Valence7
Electronegativity2.66
ElectronAffinity295.2 kJ/mol
Ionization Energies
1008.4, 1845.9, 3180 kJ/mol

Health and Safety
Autoignition PointN/A
FlashpointN/A

Classifications
Alternate NamesNone
Nams of AllotropesDiiodine
Blockp
Group17
Period5
Electron Configuration[Kr]4d105s25p5
ColorSlateGray
Discovery
1811 in France
Gas phaseN/A
CAS NumberCAS7553-56-2

Electrical properties
Electrical TypeInsulator
Electrical Conductivity1×10-7 S/m
Resistivity1×107 m Ω
Superconducting PointN/A

Magnetic properties
Magnetic TypeN/A
Mass Magnetic Susceptibility-4.5×10-9
Molar Magnetic Susceptibility-5.71×10-10
Volume Magnetic Susceptibility-0.0000222

Abundances
% in Universe1×10-7%
% in SunN/A
% in Meteorites0.000025%
% in Earth's Crust0.000049%
% in Oceans6×10-6%
% in Humans0.00002%

Atomic dimensions and structure
Atomic Radius115 pm
Covalent Radius133 pm
Van der Waals Radius198 pm
Crystal StructureBase Centered Orthorhombic
Lattice Angles
π/2, π/2, π/2
Lattice Constants
718.02, 471.02, 981.03 pm
Space Group NameCmca
Space Group Number64

Nuclear Properties
Half-LifeStable
LifetimeStable
Stable Isotopes
127I
Isotopic Abundances
127I100%

Notes on the properties of Iodine:
Specific Heat: Value given for solid phase.