Pr
Praseodymium
Z 59 140.908 g/molLanthanide
Nucleus
59 Protons
82 Neutrons
59 Electrons (5 Valence)
Shell distribution: K2 • L8 • M18 • N21 • O8 • P2 • Q0
Electron Configuration
Energy
7p
6d
5f
7s
6p
5d
4f
6s
5p
4d
5s
4p
3d
4s
3p
3s
2p
2s
1s
[Xe]4f36s2
Radii
Empirical
185 pm1.85 Å
Calculated
247 pm2.47 Å
Covalent
203±7 pm2.03±0.07 Å
van Der Waals
239 pm2.39 Å
Oxidation States
CommonRare
0
0
+1
+2
+3
+4
+5
Crystal Structure
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Double Hexagonal close-packed