|
77
Ir
192.22
Iridium |
Appearance & Characteristics | Reactions |
Other Forms Radius | Conductivity | Abundance
General:
| Name: Iridium | Symbol: Ir |
| Group: Trans. Met. | Atomic weight: 192.22 |
| Density @ 293 K: 22.42 g/cm3 | Atomic volume: 8.54 cm3/mol |
| Group: Trans. Met. | Discovered: 1804 |
States
| State (s, l, g): solid | |
| Melting point: 2683.2 K | Boiling point: 4823 K |
| Heat of fusion: 26.10 kJ/mol | Heat of vaporization: 604.0 kJ/mol |
Energies
| 1st ionization energy: 880 kJ/mole | |
| Electronegativity: 2.2 | 2nd ionization energy: kJ/mole |
| Electron affinity: 151 kJ/mole | 3rd ionization energy: kJ/mole |
| Specific heat: 0.130 J/gK | Heat atomization: 665 kJ/mole atoms |
Oxidation & Electrons
| Shells: 2,8,18,32,15,2 | Electron configuration: [Xe] 4f14 5d7 6s2 |
| Minimum oxidation number: -1 | Maximum oxidation number: 6 |
| Min. common oxidation no.: 0 | Max. common oxidation no.: 4 |
Appearance & Characteristics
| Structure: fcc: face-centered cubic | Color: white |
| Uses: Pt/Ir sparkplugs | Toxicity: |
| Hardness: 6.25 mohs | Characteristics: hard, densest el, inert |
Reactions
| Reaction with air: none | |
| Reaction with 6 M HCl: none | Reaction with 6 M HCl: none |
| Reaction with 15 M HNO3: none | Reaction with 6 M NaOH: none |
Other Forms
| Number of isotopes: 2 | Hydride(s): none |
| Oxide(s): IrO2 | Chloride(s): IrCl3 |
Radius
| Ionic radius (2- ion): pm | Ionic radius (1- ion): pm |
| Atomic radius: 136 pm | Ionic radius (1+ ion): pm |
| Ionic radius (2+ ion): pm | Ionic radius (3+ ion): 82 pm |
Conductivity
| Thermal conductivity: 147 J/m-sec-deg | |
| Electrical conductivity: 188.679 1/mohm-cm | Polarizability: 7.6 A^3 |
Abundance
| Source: nickel ores (sulfides) | |
| Rel. abund. solar system: -0.180 log | Abundance earth's crust: -3 log |
| cost, pure: 4200 $/100g | cost, bulk: $/100g |
