Cr
Chromium
Z 24 51.996 g/molTransition Metal
Nucleus
24 Protons
28 Neutrons
24 Electrons (6 Valence)
Shell distribution: K2 • L8 • M13 • N1 • 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]3d54s1
Oxidation States
CommonRare
0
Pick a state to see its ions
Radii
Empirical
140 pm1.4 Å
Calculated
166 pm1.66 Å
Covalent
139±5 pm1.39±0.05 Å
Van der Waals
189 pm1.89 Å
IonicCr3+
61.5 pm0.615 Å
Crystal Structure
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Body-centered cubic
Pearson symbol
cI2
Space group
Im3m No. 229