 |
| General |
| Name | Iron |
| Symbol | Fe |
| Number | 26 |
| Group Number | 8 |
| Group | Transition metals |
| Block | d |
| Density | 7.86 g/cm3 |
| Atomic Weight | 55.847 g/mol |
| Atomic Volume | 7.1 cm3/mol |
| Discover | None |
|
| States |
| State | Solid |
| Melting Point | 1811 K |
| Boiling Point | 3134 K |
| Triple Point | Nil |
| Critical Point | Nil |
| Heat of Fusion | 13.81 kJ/mol |
| Heat of Vaporization | 340 kJ/mol |
|
| Energies |
| First Ionization Energy | 759.3 kJ/mole |
| Second Ionization Energy | 1561.1 kJ/mole |
| Third Ionization Energy | 2957.3 kJ/mole |
| Electronegativity | 1.9 |
| Electron Affinity | 15.7 kJ/mole |
| Specific Heat | 0.44 J/gK |
| Heat Atomization | 418 kJ/mole atoms |
|
| Oxidation and Electrons |
| Shells | 2,8,14,2 |
| Electron Configuration | [Ar] 3d6 4s2 |
| Minimum Oxidation Number | -2 |
| Maximum Oxidation Number | 6 |
| Minimum Common Oxidation Number | 0 |
| Maximum Common Oxidation Number | 3 |
|
| Appearance and Characteristics |
| Crystal Structure | body-centered cubic |
| Characteristics | fairly soft when pure |
| Color | gray |
| Uses | steel |
| Hardness | 4.5 mohs |
| Toxicity | None |
|
| Reactions |
| Reaction with Air | mild, =>Fe3O4 |
| Reaction with 6M HCl | mild, =>H2, FeCl2 |
| Reaction with 15M HNO3 | passivated |
| Reaction with 6M NaOH | None |
|
| Other Forms |
| Number of Isotopes | 4 |
| Hydride | None |
| Oxide | FeO Fe3O4 Fe2O3 |
| Chloride | FeCl2 FeCl3 |
|
| Radius |
| Atomic Radius | 126 pm |
| Ionic Radius (1+ ion) | Nil |
| Ionic Radius (1- ion) | Nil |
| Ionic Radius (2+ ion) | 83.5 pm |
| Ionic Radius (2- ion) | Nil |
| Ionic Radius (3+ ion) | 73.8 pm |
|
| Conductivity |
| Thermal Conductivity | 72.8 J/m-sec-deg |
| Electrical Conductivity | 102.987 1/mohm-cm |
| Polarizability | 8.4 A3 |
|
| Abundance |
| Source | Hematite,magnetite(oxide) |
| Relation Abundance Solar System | 5.954 log |
| Abundance Earth's Crust | 4.8 log |
|
