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ନାମ, ପ୍ରତୀକ | iridium, Ir |
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Appearance | silvery white |
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ଉଚ୍ଚାରଣ | i-RID-ee-əm |
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ପରମାଣୁ କ୍ରମାଙ୍କ (Z) | 77 |
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ଶ୍ରେଣୀ, ବ୍ଳକ | group 9, d-block |
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ପର୍ଯ୍ୟାୟ | period 6 |
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ମୌଳିକ ପ୍ରକାର | transition metal |
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ମାନକ ପରମାଣବିକ ଓଜନ (Ar) | 192.217 |
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ଇଲେକ୍ଟ୍ରୋନ୍ ବିନ୍ୟାସ | [Xe] 4f14 5d7 6s2 |
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per shell | 2, 8, 18, 32, 15, 2 |
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ଅବସ୍ଥା | solid |
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ଗଳନାଙ୍କ | 2739 K (2466 °C, 4471 °F) |
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ସ୍ଫୁଟନାଙ୍କ | 4701 K (4428 °C, 8002 °F) |
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Density near r.t. | 22.56 g/cm3 |
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when liquid, at m.p. | 19 g/cm3 |
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Heat of fusion | 41.12 kJ/mol |
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Heat of | 563 kJ/mol |
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Molar heat capacity | 25.10 J/(mol·K) |
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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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Oxidation states | −3,−1, 0, 1, 2, 3, 4, 5, 6 |
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Electronegativity | Pauling scale: 2.20 |
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Atomic radius | empirical: 136 pm |
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Covalent radius | 141±6 pm |
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Crystal structure | face-centered cubic (fcc) |
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Speed of sound thin rod | 4825 m/s (at 20 °C) |
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Thermal expansion | 6.4 µm/(m·K) |
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Thermal conductivity | 147 W/(m·K) |
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Electrical resistivity | 47.1 n Ω·m (at 20 °C) |
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Magnetic ordering | paramagnetic[୧] |
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Young's modulus | 528 GPa |
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Shear modulus | 210 GPa |
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Bulk modulus | 320 GPa |
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Poisson ratio | 0.26 |
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Mohs hardness | 6.5 |
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Vickers hardness | 1760 MPa |
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Brinell hardness | 1670 MPa |
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CAS Number | 7439-88-5 |
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ଆବିଷ୍କାର | Smithson Tennant (1803) |
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First isolation | Smithson Tennant (1803) |
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| references |