Zr
Zirconium
Z 40 91.222 g/molTransition Metal
Nucleus
40 Protons
51 Neutrons
40 Electrons (4 Valence)
Shell distribution: K2 • L8 • M18 • N10 • O2 • 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]4d25s2
Radii
Empirical
155 pm1.55 Å
Calculated
206 pm2.06 Å
Covalent
175±7 pm1.75±0.07 Å
van Der Waals
186 pm1.86 Å
Oxidation States
CommonRare
-2
0
0
+1
+2
+3
+4
Crystal Structure
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Hexagonal close-packed