Fe
Iron
Z 26 55.845 g/molTransition Metal
Nucleus
26 Protons
30 Neutrons
26 Electrons (8 Valence)
Shell distribution: K2 • L8 • M14 • N2 • O0 • P0 • Q0
Electron Configuration
Energy
7p
6d
5f
7s
6p
5d
4f
6s
5p
4d
5s
4p
3d
4s
3p
3s
2p
2s
1s
[Ar]3d64s2
Oxidation States
CommonRare
0
Pick a state to see its ions
Radii
Empirical
140 pm1.4 Å
Calculated
156 pm1.56 Å
Covalentlow spin
132±3 pm1.32±0.03 Å
Van der Waals
194 pm1.94 Å
IonicFe2+ · high spin
78 pm0.78 Å
Crystal Structure
Use the arrow keys to rotate, hold Shift with the left and right arrows to roll, and press Home to reset the view.
Body-centered cubicStandard state
Pearson symbol
cI2
Space group
Im3m No. 229
Density
7.86 g/cm³