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Iridium

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Iridium, 77Ir
Pieces of pure iridium
Iridium
Pípè /ɪˈrɪdiəm/ (i-RID-ee-əm)
Ìhànsójúsilvery white
Ìwúwo átọ̀mù Ar, std(Ir)192.217(2)[1]
Iridium ní orí tábìlì àyè
Hydrogen Helium
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Rh

Ir

Mt
osmiumiridiumplatinum
Nọ́mbà átọ̀mù (Z)77
Ẹgbẹ́group 9
Àyèàyè 6
Àdìpọ̀Àdìpọ̀-d
Ẹ̀ka ẹ́límẹ́ntì  Transition metal
Ìtò ẹ̀lẹ́ktrọ́nù[Xe] 4f14 5d7 6s2
Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan2, 8, 18, 32, 15, 2
Àwọn ohun ìní ara
Ìfarahàn at STPsolid
Ìgbà ìyọ́2739 K ​(2466 °C, ​4471 °F)
Ígbà ìhó4701 K ​(4428 °C, ​8002 °F)
Kíki (near r.t.)22.56 g/cm3
when liquid (at m.p.)19 g/cm3
Heat of fusion41.12 kJ/mol
Heat of 563 kJ/mol
Molar heat capacity25.10 J/(mol·K)
 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−3, −1, 0, +1, +2, +3, +4, +5, +6, +7, +8, +9[2]
ElectronegativityPauling scale: 2.20
Atomic radiusempirical: 136 pm
Covalent radius141±6 pm
Color lines in a spectral range
Color lines in a spectral range
Spectral lines of iridium
Other properties
Natural occurrenceprimordial
Crystal structure ​(fcc)
Cubic face-centered crystal structure for iridium
Speed of sound thin rod4825 m/s (at 20 °C)
Thermal expansion6.4 µm/(m·K)
Thermal conductivity147 W/(m·K)
Electrical resistivity47.1 n Ω·m (at 20 °C)
Magnetic orderingparamagnetic[3]
Young's modulus528 GPa
Shear modulus210 GPa
Bulk modulus320 GPa
Poisson ratio0.26
Mohs hardness6.5
Vickers hardness1760 MPa
Brinell hardness1670 MPa
CAS Number7439-88-5
Main isotopes of iridium
Iso­tope Abun­dance Half-life (t1/2) Decay mode Pro­duct
188Ir syn 1.73 d ε 1.64 188Os
189Ir syn 13.2 d ε 0.532 189Os
190Ir syn 11.8 d ε 2.000 190Os
191Ir 37.3% 191Ir is stable with 114 neutrons
192Ir syn 73.827 d β- 1.460 192Pt
ε 1.046 192Os
192m2Ir syn 241 y IT 0.161 192Ir
193Ir 62.7% 193Ir is stable with 116 neutrons
193mIr syn 10.5 d IT 0.080 193Ir
194Ir syn 19.3 h β- 2.247 194Pt
194m2Ir syn 171 d IT ? 194Ir
Àdàkọ:Category-inline
| references


  1. Meija, Juris; Coplen, Tyler B.; Berglund, Michael; Brand, Willi A.; De Bièvre, Paul; Gröning, Manfred; Holden, Norman E.; Irrgeher, Johanna et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry 88 (3): 265–91. doi:10.1515/pac-2015-0305. 
  2. 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. 
  3. Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81th edition, CRC press.