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Iron (Fe)
Atomic number 26 · transition
| Atomic number | 26 |
|---|---|
| Atomic mass | 55.845 u |
| Molar mass | 55.845 g/mol |
| Category | transition |
| Group / period / block | 8 / 4 / d |
| Electron configuration | [Ar] 3d6 4s2 |
| Electrons per shell | 2, 8, 14, 2 |
| Electronegativity (Pauling) | 1.83 |
| Atomic radius | 140.0 pm |
| Density | 7.87 g/cm³ |
| First ionisation energy | 7.9025 eV |
| Melting point | 1811.15 K (1538.00 °C) |
| Boiling point | 3134.15 K (2861.00 °C) |
| Common oxidation states | +2, +3 |
| Abundance in Earth's crust | 56300 ppm |
Uses
Steel, construction, haemoglobin in blood
Discovery
Known since ancient times