Iridium Element Properties, Transition metals Group, Periodic Table of the Elements
Iridium
|
Iridium Element Properties |
 | | General |
| Name | Iridium |
| Symbol | Ir |
| Number | 77 |
| Group Number | 9 |
| Group | Transition metals |
| Block | d |
| Density | 22.42 g/cm3 |
| Atomic Weight | 192.22 g/mol |
| Atomic Volume | 8.54 cm3/mol |
| Discover | 1804 |
|
| States |
| State | Solid |
| Melting Point | 2739 K |
| Boiling Point | 4701 K |
| Triple Point | Nil |
| Critical Point | Nil |
| Heat of Fusion | 41.12 kJ/mol |
| Heat of Vaporization | 563 kJ/mol |
|
| Energies |
| First Ionization Energy | 880 kJ/mole |
| Second Ionization Energy | Nil |
| Third Ionization Energy | Nil |
| Electronegativity | 2.2 |
| Electron Affinity | 151 kJ/mole |
| Specific Heat | 0.130 J/gK |
| Heat Atomization | 665 kJ/mole atoms |
|
| Oxidation and Electrons |
| Shells | 2,8,18,32,15,2 |
| Electron Configuration | [Xe] 4f14 5d7 6s2 |
| Minimum Oxidation Number | 1 |
| Maximum Oxidation Number | 6 |
| Minimum Common Oxidation Number | 0 |
| Maximum Common Oxidation Number | 4 |
|
| Appearance and Characteristics |
| Crystal Structure | cubic face centered |
| Characteristics | hard, densest el, inert |
| Color | white |
| Uses | Pt/Ir sparkplugs |
| Hardness | 6.25 mohs |
| Toxicity | None |
|
| Reactions |
| Reaction with Air | None |
| Reaction with 6M HCl | None |
| Reaction with 15M HNO3 | None |
| Reaction with 6M NaOH | None |
|
| Other Forms |
| Number of Isotopes | 2 |
| Hydride | None |
| Oxide | IrO2 |
| Chloride | IrCl3 |
|
| Radius |
| Atomic Radius | 136 pm |
| Ionic Radius (1+ ion) | Nil |
| Ionic Radius (1- ion) | Nil |
| Ionic Radius (2+ ion) | Nil |
| Ionic Radius (2- ion) | Nil |
| Ionic Radius (3+ ion) | 82 pm |
|
| Conductivity |
| Thermal Conductivity | 147 J/m-sec-deg |
| Electrical Conductivity | 188.679 1/mohm-cm |
| Polarizability | 7.6 A3 |
|
| Abundance |
| Source | nickel ores (sulfides) |
| Relation Abundance Solar System | -0.180 log |
| Abundance Earth's Crust | -3 log |
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