Iodine Element Properties, Halogen Group, Periodic Table of the Elements
Iodine
|
Iodine Element Properties |
 | | General |
| Name | Iodine |
| Symbol | I |
| Number | 53 |
| Group Number | 17 |
| Group | Halogen |
| Block | p |
| Density | 4.93 g/cm3 |
| Atomic Weight | 126.9045 g/mol |
| Atomic Volume | 25.74 cm3/mol |
| Discover | 1811 |
|
| States |
| State | Solid |
| Melting Point | 386.85 K |
| Boiling Point | 457.4 K |
| Triple Point | Nil |
| Critical Point | 819 K |
| Heat of Fusion | 15.52 kJ/mol |
| Heat of Vaporization | 41.57 kJ/mol |
|
| Energies |
| First Ionization Energy | 1008.4 kJ/mole |
| Second Ionization Energy | 1845.8 kJ/mole |
| Third Ionization Energy | 3184 |
| Electronegativity | 2.66 |
| Electron Affinity | 295.16 kJ/mole |
| Specific Heat | 0.214 J/gK |
| Heat Atomization | 107 kJ/mole atoms |
|
| Oxidation and Electrons |
| Shells | 2,8,18,18,7 |
| Electron Configuration | [Kr] 4d10 5s2 5p5 |
| Minimum Oxidation Number | -1 |
| Maximum Oxidation Number | 7 |
| Minimum Common Oxidation Number | 0 |
| Maximum Common Oxidation Number | 7 |
|
| Appearance and Characteristics |
| Crystal Structure | orthorhombic |
| Characteristics | diatomic |
| Color | bluish-black |
| Uses | nutrient, antiseptic |
| Hardness | Nil |
| Toxicity | Yes |
|
| Reactions |
| Reaction with Air | None |
| Reaction with 6M HCl | None |
| Reaction with 15M HNO3 | mild, =>HIO3 |
| Reaction with 6M NaOH | mild, =>OI-, I- |
|
| Other Forms |
| Number of Isotopes | 1 |
| Hydride | HI |
| Oxide | I2O5 I4O9 I2O4 |
| Chloride | ICl ICl3 |
|
| Radius |
| Atomic Radius | 133 pm |
| Ionic Radius (1+ ion) | Nil |
| Ionic Radius (1- ion) | 206 pm |
| Ionic Radius (2+ ion) | Nil |
| Ionic Radius (2- ion) | Nil |
| Ionic Radius (3+ ion) | Nil |
|
| Conductivity |
| Thermal Conductivity | 0.45 J/m-sec-deg |
| Electrical Conductivity | 0 1/mohm-cm |
| Polarizability | 5 A3 |
|
| Abundance |
| Source | Brines, Chilean nitrate (misc) |
| Relation Abundance Solar System | -0.046 log |
| Abundance Earth's Crust | -0.3 log |
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