Co
Cobalt
Z 27 58.933 g/molTransition Metal
Nucleus
27 Protons
32 Neutrons
27 Electrons (9 Valence)
Shell distribution: K2 • L8 • M15 • 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]3d74s2
Radii
Empirical
135 pm1.35 Å
Calculated
152 pm1.52 Å
Covalent
126±3 pm1.26±0.03 Å
van Der Waals
192 pm1.92 Å
Oxidation States
CommonRare
-3
-1
0
0
+1
+2
+3
+4
+5
Crystal Structure
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Hexagonal close-packed