26Fe55.84
Iron
Transition Metal
Solid at STP
Period 4Group 8Block DDiscovered Ancient
[Ar]4s2 3d6
Iron is a chemical element with symbol Fe (from Latin:ferrum) and atomic number 26. It is a metal in the first transition series. It is by mass the most common element on Earth, forming much of Earth's outer and inner core.
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Atomic Properties
| Atomic Number | 26 |
| Atomic Mass | 55.84 u |
| Electron Configuration | [Ar]4s2 3d6 |
| Oxidation States | +3, +2 |
| Electronegativity | 1.83 (Pauling) |
| Atomic Radius | 194 pm |
| Ionization Energy | 7.902 eV |
| Electron Affinity | 0.163 eV |
| Block | D |
Physical Properties
| Appearance | lustrous metallic with a grayish tinge |
| Standard State | Solid |
| Melting Point | 1811 K (1537.8 °C) |
| Boiling Point | 3134 K (2860.8 °C) |
| Density | 7.874 g/cm³ |
| Molar Heat | 25.1 J/(mol·K) |
| CPK Color | #E06633 |
Classification
| Category | Transition Metal |
| Group Block | Transition metal |
| Period | 4 |
| Group | 8 |
| Block | D |
Discovery
| Year Discovered | Ancient |
| Discovered By | 5000 BC |
| Electron Shells | 2, 8, 14, 2 |