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Iridium, 77 Ir Iridium Pronunciation (Template:Respell ) Appearance silvery white Standard atomic weight A r, std (Ir) Template:Val [1] Iridium in the periodic table
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 2739 K (2466 °C, 4471 °F) Boiling point 4701 K (4428 °C, 8002 °F) Density (near r.t. ) 22.56 [2] g/cm3 when liquid (at m.p. ) 19 g/cm3 Heat of fusion 41.12 kJ/mol Heat of vaporization 563 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 −3, −1, 0, +1, +2, +3 , +4 , +5, +6, +7, +8, +9[3] Electronegativity Pauling scale: 2.20 Atomic radius empirical: 136 pm Covalent radius 141±6 pm Spectral lines of iridiumOther properties Natural occurrence primordial Crystal structure face-centered cubic (fcc) 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 n Ω·m (at 20 °C) Magnetic ordering paramagnetic [4] Young's modulus 528 GPa Shear modulus 210 GPa Bulk modulus 320 GPa Poisson ratio 0.26 Mohs hardness 6.5 Vickers hardness 1760 MPa Brinell hardness 1670 MPa CAS Number 7439-88-5 Main isotopes of iridium
Category: Iridium | references
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References
These references will appear in the article, but this list appears only on this page.
↑ Meija, Juris; 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 .
↑ J. W. Arblaster: Densities of Osmium and Iridium , in: Platinum Metals Review, 1989, 33, 1, S. 14–16; Volltext .
↑ 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 Handbook of Chemistry and Physics 81st edition, CRC press.