Iridium

Iridium
77Ir
Rh ↑ Ir ↓ Mt Tábìlì ìdásìkò osmium ← iridium → platinum
Ìhànsójú
silvery white
Àwọn ìdámọ́ wíwọ́pọ̀
Orúkọ, àmì-ìdámọ́, nọ́mbà	iridium, Ir, 77
Ẹ̀ka ẹ́límẹ̀nti	transition metal
Ẹgbẹ́, àsìkò, àdìpò	9, 6, d
Ìwúwo átọ́mù	192.217
Ìtòléra ẹ̀lẹ́ktrónì	[Xe] 4f14 5d7 6s2 2, 8, 18, 32, 15, 2
Physical properties
Phase	solid
Density (near r.t.)	22.56 g·cm−3
Liquid density at m.p.	19 g·cm−3
Melting point	2739 K, 2466 °C, 4471 °F
Boiling point	4701 K, 4428 °C, 8002 °F
Heat of fusion	41.12 kJ·mol−1
Heat of vaporization	563 kJ·mol−1
Molar heat capacity	25.10 J·mol−1·K−1
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
Electronegativity	2.20 (Pauling scale)
Ionization energies	1st: 880 kJ·mol−1
	2nd: 1600 kJ·mol−1
Atomic radius	136 pm
Covalent radius	141±6 pm
Miscellanea
Crystal structure	cubic face-centered
Magnetic ordering	paramagnetic
Electrical resistivity	(20 °C) 47.1 nΩ·m
Thermal conductivity	147 W·m−1·K−1
Thermal expansion	6.4 µm/(m·K)
Speed of sound (thin rod)	(20 °C) 4825 m·s−1
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 registry number	7439-88-5
Àwọn ísótòpù dídúró jùlọ
Main article: Àwọn ísótòpù iridium
iso NA half-life DM DE (MeV) DP 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