Iridium

Iridium, ₇₇Ir
Iridium
Pípè	/ɪˈrɪdiəm/ (i-RID-ee-əm)
Ìhànsójú	silvery white
Ìwúwo átọ̀mù Ar, std(Ir)	192.217(2)
Iridium ní orí tábìlì àyè
	osmium ← iridium → platinum
Nọ́mbà átọ̀mù (Z)	77
Ẹgbẹ́	group 9
Àyè	àyè 6
Àdìpọ̀	Àdìpọ̀-d
Ẹ̀ka ẹ́límẹ́ntì	Transition metal
Ìtò ẹ̀lẹ́ktrọ́nù	[Xe] 4f14 5d7 6s2
Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan	2, 8, 18, 32, 15, 2
Àwọn ohun ìní ara
Ìfarahàn at STP	solid
Ìgbà ìyọ́	2739 K (2466 °C, 4471 °F)
Ígbà ìhó	4701 K (4428 °C, 8002 °F)
Kíki (near r.t.)	22.56 g/cm3
when liquid (at m.p.)	19 g/cm3
Heat of fusion	41.12 kJ/mol
Heat of	563 kJ/mol
Molar heat capacity	25.10 J/(mol·K)
Atomic properties
Oxidation states	−3, −1, 0, +1, +2, +3, +4, +5, +6, +7, +8, +9
Electronegativity	Pauling scale: 2.20
Atomic radius	empirical: 136 pm
Covalent radius	141±6 pm
	Spectral lines of iridium
Other properties
Natural occurrence	primordial
Crystal structure	(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
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
	Àdàkọ:Category-inline; wo; ọ̀rọ̀; àtúnṣe; \| references

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Itokasi[àtúnṣe | àtúnṣe àmìọ̀rọ̀]

↑ 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.
↑ 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.
↑ Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81th edition, CRC press.