Iridio

Iridium
77Ir
Rh ↑ Ir ↓ Mt Periodic table osmium ← iridium → platinum
Appearance
silvery white
General properties
Name, simbolo, kaiphan	iridium, Ir, 77
Pronunciation	Plantilya:IPAc-en Plantilya:Respell
Element category	puthaw nga transisyon
Group, period, block	9, 6, d
Standard atomic weight	192.217
Electron configuration	[Xe] 4f14 5d7 6s2 2, 8, 18, 32, 15, 2
History
Discovery	Smithson Tennant (1803)
First isolation	Smithson Tennant (1803)
Physical properties
Phase	magahi
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	face-centered cubic
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
Most stable isotopes
Main article: Isotopes of 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

Ang iridio (Iningles iridium) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga Ir ug kaiphan nga atomik 77. Ang iridio mao ang puthaw nga transisyon.

Galeriya sa hulagway

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