Periodic table of the elements
OsmiumIridiumPlatinum
77
Ir
Iridium
192.217
2
8
18
32
15
2
77
Ir
Iridium
192.217
2
8
18
32
15
2
General
NameIridium
SymbolIr
Number77
Chemical seriesTransition elements
Group / Period9 / 6
Blockd-block
CAS registry number7439-88-5

Physical properties
Statesolid
Density22.42 g/cm3
Melting point2739 K (2466 °C, 4471 °F)
Boiling point4701 K (4428 °C, 8002 °F)
Critical point

Atomic properties
Atomic Weight192.217 g/mol
Crystal structurecubic face centered
Electronegativity2.20
Atomic radius135 pm
Atomic radius (calculated)180 pm
Electron configuration[Xe] 4f14 5d7 6s2
Electrons per shell2, 8, 18, 32, 15, 2
Number of protons77
Number of neutrons115

Other languages
SpanishIridio
PortugueseIrí­dio
FrenchIridium
GermanIridium
ItalianIridio
RussianИридий
PolishIryd
Chinese
Arabicإريديوم
Turkishİridyum
DutchIridium


Periodic table of the elements
OsmiumIridiumPlatinum