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Technical data for Iridium

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Overview
NameIridium
SymbolIr
Atomic Number77
Atomic Weight192.217
Density22.56 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
Critical PressureN/A
Critical TemperatureN/A
Heat of Fusion26 kJ/mol
Heat of Vaporization560 kJ/mol
Heat of CombustionN/A
Specific Heat131 J/(kg K)[note]
Adiabatic IndexN/A
Neel PointN/A
Thermal Conductivity150 W/(m K)
Thermal Expansion6.4×10-6 K-1

Bulk physical properties
Density22.56 g/cm3
Density (Liquid)19 g/cm3
Molar Volume8.5203×10-6
Brinell Hardness1670 MPa
Mohs Hardness6.5 MPa
Vickers Hardness1760 MPa
Bulk Modulus320 GPa
Shear Modulus210 GPa
Young Modulus528 GPa
Poisson Ratio0.26
Refractive IndexN/A
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
Heat of CombustionN/A
DOT Hazard Class4.1
DOT Numbers3089
EU NumberN/A
NFPA Fire RatingN/A
NFPA HazardsN/A
NFPA Health RatingN/A
NFPA Reactivity RatingN/A
RTECS NumberN/A
NFPA LabelN/A

Classifications
Alternate NamesNone
Names of AllotropesNone
Blockd
Group9
Period6
Electron Configuration[Xe]4f145d76s2
ColorSilver
Discovery
1803 in France and United Kingdom
Gas phaseN/A
CAS NumberCAS7439-88-5
CID NumberCID23924
Gmelin NumberN/A
NSC NumberN/A
RTECS NumberN/A

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 Susceptibility1.67×10-9
Molar Magnetic Susceptibility3.21×10-10
Volume Magnetic Susceptibility0.0000377

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
Decay ModeN/A
Quantum Numbers4F9/2
Neutron Cross Section425
Neutron Mass Absorption0.08
Known Isotopes
164Ir, 165Ir, 166Ir, 167Ir, 168Ir, 169Ir, 170Ir, 171Ir, 172Ir, 173Ir, 174Ir, 175Ir, 176Ir, 177Ir, 178Ir, 179Ir, 180Ir, 181Ir, 182Ir, 183Ir, 184Ir, 185Ir, 186Ir, 187Ir, 188Ir, 189Ir, 190Ir, 191Ir, 192Ir, 193Ir, 194Ir, 195Ir, 196Ir, 197Ir, 198Ir, 199Ir
Stable Isotopes
191Ir, 193Ir
Isotopic Abundances
191Ir37.3%
193Ir62.7%


Notes on the properties of Iridium:

Specific Heat: Value given for solid phase.

Up to date, curated data provided by
Mathematica's ElementData function from Wolfram Research, Inc.

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