Iridium
Lát'ọwọ́ Wikipedia, ìwé ìmọ̀ ọ̀fẹ́
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| Ìfarahàn |
silvery white
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| Àwọn ìní àníkárí |
| Orúkọ, àmì-ìdámọ̀, nọ́mbà |
iridium, Ir, 77 |
| Ẹ̀ka apilẹ̀sẹ̀ |
transition metal |
| Àdìpọ̀, ìgbà, block |
9, 6, d |
| Ìwúwo átọ́mù |
192.217 g·mol−1 |
| Ìtòjọ ẹ̀lẹ́ktrónì |
[Xe] 4f14 5d7 6s2 |
| Àwọn ẹ̀lẹ́ktrónì lórí ọ̀nà kan |
2, 8, 18, 32, 15, 2 (Image) |
| Àwọn ìní aláfójúrí |
| Phase |
solid |
| Kíki (tó súnmọ́ r.t.) |
22.56 g·cm−3 |
| Liquid density at m.p. |
19 g·cm−3 |
| ojúàmì ìyọ́ |
2739 K, 2466 °C, 4471 °F |
| ajúàmì ìhó |
4701 K, 4428 °C, 8002 °F |
| Heat of fusion |
41.12 kJ·mol−1 |
| Heat of vaporization |
563 kJ·mol−1 |
| Specific 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 |
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| 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[1] |
| Electrical resistivity |
(20 °C) 47.1 nΩ·m |
| Thermal conductivity |
(300 K) 147 W·m−1·K−1 |
| Thermal expansion |
6.4 µm/(m·K) |
| 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 |
| Most stable isotopes |
| Main article: Isotopes of iridium |
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