Template:Infobox iridium

Iridium, ₇₇Ir

Pieces of pure iridium
Iridium
Pronunciation	/ɪˈrɪdiəm/ ​(i-RID-ee-əm)
Appearance	Silvery white
Standard atomic weight Ar°(Ir)
	192.217±0.002 192.22±0.01 (abridged)
Iridium in the periodic table
Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Rh ↑ Ir ↓ Mt osmium ← iridium → platinum
Atomic number (Z)	77
Group	group 9
Period	period 6
Block	d-block
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 (at 20° C)	22.562 g/cm3
when liquid (at m.p.)	19 g/cm3
Heat of fusion	41.12 kJ/mol
Heat of vaporization	564 kJ/mol
Molar heat capacity	25.10 J/(mol·K)
Vapor pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 2713 2957 3252 3614 4069 4659
Atomic properties
Oxidation states	common: +3, +4 −3,? −2,? −1, 0,? +1, +2, +5, +6, +7,? +8,? +9
Electronegativity	Pauling scale: 2.20
Ionization energies	1st: 880 kJ/mol 2nd: 1600 kJ/mol
Atomic radius	empirical: 136 pm
Covalent radius	141±6 pm
Color lines in a spectral range Spectral lines of iridium
Other properties
Natural occurrence	primordial
Crystal structure	​face-centered cubic (fcc) (cF4)
Lattice constant	Face-centered cubic crystal structure for iridium a = 383.92 pm (at 20 °C)
Thermal expansion	6.47×10−6/K (at 20 °C)
Thermal conductivity	147 W/(m⋅K)
Electrical resistivity	47.1 nΩ⋅m (at 20 °C)
Magnetic ordering	paramagnetic
Molar magnetic susceptibility	+25.6 × 10−6 cm3/mol (298 K)
Young's modulus	528 GPa
Shear modulus	210 GPa
Bulk modulus	320 GPa
Speed of sound thin rod	4825 m/s (at 20 °C)
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)
Isotopes of iridium
Main isotopes Decay abun­dance half-life (t1/2) mode pro­duct 191Ir 37.3% stable 192Ir synth 73.827 d β− 192Pt ε 192Os 192m2Ir synth 241 y IT 192Ir 193Ir 62.7% stable

Ir · Iridium
Os ← ibox Os	iso 77 Ir  [] IB-Ir [] IBisos []	→ Pt ibox Pt
File:Symbol category class.svg cat:Ir (0) File:Symbol category class.svg cat:Ir-isotopes (0) File:Commons-logo.svg Commons File:Wikidata-logo.svg Wikidata:Q877 File:Wiktionary-logo.svg Wiktionary
indexes by PT (page)

child table, as reused in {IB-Ir}
Main isotopes of iridium
Main isotopes Decay abun­dance half-life (t1/2) mode pro­duct 191Ir 37.3% stable 192Ir synth 73.827 d β− 192Pt ε 192Os 192m2Ir synth 241 y IT 192Ir 193Ir 62.7% stable

Data sets read by {{Infobox element}}
Name and identifiers
Symbol etymology (11 non-trivial)
Top image (caption, alt)	caption: alt:
Pronunciation
Allotropes (overview)
Group (overview)
Period (overview)
Block (overview)
Natural occurrence
Phase at STP
Oxidation states
Spectral lines image
Electron configuration (cmt, ref)
Isotopes
Standard atomic weight
most stable isotope
File:Notification-icon-Wikidata-logo.svg Wikidata
Wikidata *
* Not used in {{Infobox element}} (2023-01-01) See also {{Index of data sets}} · Cat:data sets (0) · (this table: )

References

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