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
Oxidation States
CommonRare
0
Pick a state to see its ions
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
IonicZr4+
72 pm0.72 Å
Crystal Structure
Use the arrow keys to rotate, hold Shift with the left and right arrows to roll, and press Home to reset the view.
Hexagonal close-packedStandard state
Pearson symbol
hP2
Space group
P63/mmc No. 194
Density
6.52 g/cm³