Nb
Niobium
Z 41 92.906 g/molTransition Metal
Nucleus
41 Protons
52 Neutrons
41 Electrons (5 Valence)
Shell distribution: K2 • L8 • M18 • N12 • O1 • P0 • Q0
Electron Configuration
Energy
7p
6d
5f
7s
6p
5d
4f
6s
5p
4d
5s
4p
3d
4s
3p
3s
2p
2s
1s
[Kr]4d45s1
Oxidation States
CommonRare
0
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Radii
Empirical
145 pm1.45 Å
Calculated
198 pm1.98 Å
Covalent
164±6 pm1.64±0.06 Å
Van der Waals
207 pm2.07 Å
IonicNb5+
64 pm0.64 Å
Crystal Structure
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Body-centered cubic
Pearson symbol
cI2
Space group
Im3m No. 229