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
Radii
Empirical
140 pm1.4 Å
Calculated
156 pm1.56 Å
Covalent
132±3 pm1.32±0.03 Å
van Der Waals
194 pm1.94 Å
Oxidation States
CommonRare
-2
-1
0
0
+1
+2
+3
+4
+5
+6
+7
Crystal Structure
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Body-centred Cubic