Iron (Fe)
Iron (Fe) is element 26 of the periodic table, a transition metal in period 4 and group 8. Its standard atomic weight is 55.845, so one mole of iron atoms has a mass of 55.845 g. At room temperature it is a solid; it melts at 1537.85 °C and boils at 2860.85 °C.
| Atomic number | 26 |
|---|---|
| Symbol | Fe |
| Standard atomic weight | 55.845 |
| Molar mass | 55.845 g/mol |
| Category | Transition metal |
| Group | 8 |
| Period | 4 |
| Block | d-block |
| Electron configuration | [Ar] 4s2 3d6 |
| Oxidation states | +3, +2 |
| Electronegativity (Pauling) | 1.83 |
| Atomic radius (van der Waals) | 194 pm |
| First ionisation energy | 7.902 eV (762.4 kJ/mol) |
| Electron affinity | 0.163 eV |
| State at room temperature | Solid |
| Melting point | 1811 K (1537.85 °C) |
| Boiling point | 3134 K (2860.85 °C) |
| Density | 7.874 g/cm³ |
| Discovered | Known since antiquity |
Group 8
Calculate with Iron
Atomic weight: IUPAC CIAAW standard atomic weight. Other properties: PubChem (U.S. National Library of Medicine, public domain). Values such as melting point and radius depend on how they were measured; check a data book for precise work.