Template:Infobox iridium

Iridium,  ₇₇Ir

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General properties
Pronunciation	Template:Infobox element/pronunciation
Appearance	silvery white
Standard atomic weight (Ar, standard)	Template:Infobox element/standard atomic weight
Mass number	Template:Infobox element/symbol-to-most-stable-isotope (most stable isotope)
Iridium in the periodic table
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Atomic number (Z)	77
Group	Template:Infobox element/group
Period	period 6
Block	d-block
Element category	Template:Infobox element/category format
Electron configuration	[Xe] 4f14 5d7 6s2
Electrons per shell	2, 8, 18, 32, 15, 2
Physical properties
Phase at STP	solid
Melting point	2719 K ​(2446 °C, ​4435 °F)
Boiling point	4403 K ​(4130 °C, ​7466 °F)
Density (near r.t.)	22.56 g/cm3
when liquid (at m.p.)	19 g/cm3
Heat of fusion	41.12 kJ/mol
[[Enthalpy of vaporization|Heat of Template:Engvar]]	564 kJ/mol
Molar heat capacity	25.10 J/(mol·K)
[[Vapor pressure|Template:Engvar pressure]] Template:Infobox element/vapor pressure table
Atomic properties
Oxidation states	Template:Infobox element/symbol-to-oxidation-state
Electronegativity	Pauling scale: 2.20
[[Ionization energy|Template:Engvar energies]]	1st: 880 kJ/mol 2nd: 1600 kJ/mol
Atomic radius	empirical: 136 pm
Covalent radius	141±6 pm
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Other properties
Crystal structure	​Template:Infobox element/crystal structure Template:Infobox element/crystal structure
Speed of sound thin rod	4825 m/s (at 20 °C)
Thermal expansion	6.4 µm/(m·K)
Thermal conductivity	147 W/(m·K)
Electrical resistivity	47.1 nΩ·m (at 20 °C)
Magnetic ordering	paramagnetic
Magnetic susceptibility	+25.6·10−6 cm3/mol (298 K)
Young's modulus	528 GPa
Shear modulus	210 GPa
Bulk modulus	320 GPa
Poisson ratio	0.26
Mohs hardness	6.5
Vickers hardness	1760–2200 MPa
Brinell hardness	1670 MPa
CAS Number	7439-88-5
History
Discovery and first isolation	Smithson Tennant (1803)
Main isotopes of iridium
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