26 - Iron transition metal
Discovered by 5000 BC in ~5000 BC
- Atomic Radius (Å)
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.
| Shell | Electrons | Orbitals |
|---|---|---|
| 1 | 2 | 2 in 1s |
| 2 | 8 | 2 in 2s + 6 in 2p |
| 3 | 14 | 2 in 3s + 6 in 3p + 6 in 3d |
| 4 | 2 | 2 in 4s |
55.85 u
Atomic Mass
1.7 Å
Atomic Radius
3134 K
Boiling Point
1.32 Å
Covalent Radius
7.87 g/cm³
Density
14.79
Electron Affinity
1.83
Electronegativity
7.9 eV
First Ionization Energy
1808.15 K
Melting Point
4
Number of Shells
26
Atomic Number
2, 8, 14, 2
Electron Shell Occupations
