Template:Infobox iridium/sandbox

Iridium, ₀₀Ir
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
	osmium ← iridium → platinum
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	2739 K (2466 °C, 4471 °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
Heat of vaporization	564 kJ/mol
Molar heat capacity	25.10 J/(mol·K)
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
	Spectral lines of iridium
Other properties
Natural occurrence	primordial
Crystal structure	face-centered cubic (fcc)
Thermal expansion	6.4 µm/(m⋅K)
Thermal conductivity	147 W/(m⋅K)
Electrical resistivity	47.1 n Ω⋅m (at 20 °C)
Magnetic ordering	paramagnetic
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 MPa
Brinell hardness	1670 MPa
CAS Number	7439-88-5
History
Discovery	Smithson Tennant (1803)
First isolation	Smithson Tennant (1803)
Isotopes of iridium v; e;
ε	192Os
	Category: Iridium; view; talk; edit; \| references

References

^ "Standard Atomic Weights: Iridium". CIAAW. 2017.
^ Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.
^ ^a ^b ^c ^d ^e Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 28. ISBN 978-0-08-037941-8.
^ Wang, Guanjun; Zhou, Mingfei; Goettel, James T.; Schrobilgen, Gary G.; Su, Jing; Li, Jun; Schlöder, Tobias; Riedel, Sebastian (2014). "Identification of an iridium-containing compound with a formal oxidation state of IX". Nature. 514 (7523): 475–477. Bibcode:2014Natur.514..475W. doi:10.1038/nature13795. PMID 25341786. S2CID 4463905.
^ Magnetic susceptibility of the elements and inorganic compounds, in Lide, D. R., ed. (2005). CRC Handbook of Chemistry and Physics (86th ed.). Boca Raton, Florida: CRC Press. ISBN 0-8493-0486-5.
^ Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.

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