Technical data for Iridium

Overview
NameIridium
SymbolIr
Atomic Number77
Atomic Weight192.217
Density22.65 g/cm3
Melting Point2466 °C
Boiling Point4428 °C

Thermal properties
PhaseSolid
Melting Point2466 °C
Boiling Point4428 °C
Absolute Melting Point2739 K
Absolute Boiling Point4701 K
Heat of Fusion26 kJ/mol
Heat of Vaporization560 kJ/mol
Heat of CombustionN/A
Specific Heat131 J/(kg K)[note]
Thermal Conductivity150 W/(m K)
Thermal Expansion6.4×10-6 K-1

Bulk physical properties
Density22.65 g/cm3
Density (Liquid)19 g/cm3
Molar Volume8.4864×10-6
Brinell Hardness1670 MPa
Mohs Hardness6.5 MPa
Vickers Hardness1760 MPa
Bulk Modulus320 GPa
Shear Modulus210 GPa
Young Modulus528 GPa
Poisson Ratio0.26
Speed of Sound4825 m/s
Thermal Conductivity150 W/(m K)
Thermal Expansion6.4×10-6 K-1

Reactivity
Valence6
Electronegativity2.2
ElectronAffinity151 kJ/mol
Ionization Energies
880, 1.6×103 kJ/mol

Health and Safety
Autoignition PointN/A
FlashpointN/A

Classifications
Alternate NamesNone
Nams of AllotropesNone
Blockd
Group9
Period6
Electron Configuration[Xe]4f145d76s2
ColorSilver
Discovery
1803 in France and United Kingdom
Gas phaseN/A
CAS NumberCAS7439-88-5

Electrical properties
Electrical TypeConductor
Electrical Conductivity2.1×107 S/m
Resistivity4.7×10-8 m Ω
Superconducting Point0.11

Magnetic properties
Magnetic TypeParamagnetic
Curie PointN/A
Mass Magnetic Susceptibility2.3×10-9
Molar Magnetic Susceptibility4.42×10-10
Volume Magnetic Susceptibility0.0000521

Abundances
% in Universe2×10-7%
% in Sun2×10-7%
% in Meteorites0.000054%
% in Earth's Crust4×10-8%
% in OceansN/A
% in HumansN/A

Atomic dimensions and structure
Atomic Radius180 pm
Covalent Radius137 pm
Van der Waals RadiusN/A
Crystal StructureFace Centered Cubic
Lattice Angles
π/2, π/2, π/2
Lattice Constants
383.9, 383.9, 383.9 pm
Space Group NameFm_ 3m
Space Group Number225

Nuclear Properties
Half-LifeStable
LifetimeStable
Stable Isotopes
191Ir, 193Ir
Isotopic Abundances
191Ir37.3%
193Ir62.7%

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