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Iridium
Chemical Properties & Compounds
| Symbol | Atomic Number | Atomic Weight | Melting Point | Boiling Point | Phase | Density | Classification |
| Ir | 77 | 192.217 | 2446 °C | 4428 °C | Solid | 22.65 g/cm3 | Noble Metal |
|
|
|
| General |
| Name, Symbol, Number |
iridium, Ir, 77 |
| Chemical series |
transition metals |
| Group, Period, Block |
9, 6, d |
| Appearance |
silvery white
 |
| Standard atomic weight |
192.217(3) g·mol−1 |
| Electron configuration |
[Xe] 4f14 5d7 6s2 |
| Electrons per shell |
2, 8, 18, 32, 15, 2 |
| Physical properties |
| Phase |
solid |
| Density (near r.t.) |
22.42 g·cm−3 |
| Liquid density at m.p. |
19 g·cm−3 |
| Melting point |
2719 K
(2446 °C, 4435 °F) |
| Boiling point |
4701 K
(4428 °C, 8002 °F) |
| Heat of fusion |
41.12 kJ·mol−1 |
| Heat of vaporization |
563 kJ·mol−1 |
| Heat capacity |
(25 °C) 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 |
| Crystal structure |
cubic face centered |
| Oxidation states |
2, 3, 4, 6
(mildly basic oxide) |
| Electronegativity |
2.20 (scale Pauling) |
| Ionization energies |
1st: 880 kJ/mol |
| 2nd: 1600 kJ/mol |
| Atomic radius |
135 pm |
| Atomic radius (calc.) |
180 pm |
| Covalent radius |
137 pm |
| Miscellaneous |
| Magnetic ordering |
no data |
| Electrical resistivity |
(20 °C) 47.1 n Ω·m |
| Thermal conductivity |
(300 K) 147 W·m−1·K−1 |
| Thermal expansion |
(25 °C) 6.4 µm·m−1·K−1 |
| Speed of sound (thin rod) |
(20 °C) 4825 m/s |
| 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 |
| Selected isotopes |
|
|
| References |
|
Iridium Compounds
|
Source: Wikipedia article Iridium
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Chemistry Quick Facts
