Iron (Fe) — Element 26: Properties & Data | Aladdin Scientific
Iron(Fe) — Element 26
Iron (Fe) is a transition metal with atomic number 26 and atomic mass 55.84. It has melting point 1811 K (1538 °C), boiling point 3134 K (2861 °C), density 7.874 g/cm³. It sits in group 8 and period 4 of the periodic table and has been known since antiquity.
Key facts
| Atomic mass | 55.8400 u |
|---|---|
| Electron configuration | [Ar]4s2 3d6 |
| Oxidation states | +3, +2 |
| Electronegativity (Pauling) | 1.83 |
| Atomic radius (van der Waals) | 194 pm |
| Ionization energy | 7.902 eV |
| Electron affinity | 0.163 eV |
| Melting point | 1811 K |
| Boiling point | 3134 K |
| Density | 7.874 g/cm³ |
| Standard state | Solid |
| Year discovered | Ancient |
Frequently asked questions
What is the electron configuration of iron?
The ground-state electron configuration of iron is [Ar]4s2 3d6.
What group and period is iron in?
Iron (Fe) is in group 8 and period 4 of the periodic table, classified as a transition metal.
What is the melting point of iron?
Iron melts at 1811 K (1538 °C).
What is the standard state of iron?
Iron is a solid at standard temperature and pressure.
Related elements
About this data: property values compiled from IUPAC Standard Atomic Weights (2021), the NIST Atomic Spectra Database, and PubChem. Curated by the Aladdin Scientific technical team. Last reviewed: .