Pm
Promethium
Z 61 145.0 g/molLanthanide Radioactive
Nucleus
61 Protons
84 Neutrons
61 Electrons (7 Valence)
Shell distribution: K2 • L8 • M18 • N23 • 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]4f56s2
Radii
Empirical
185 pm1.85 Å
Calculated
205 pm2.05 Å
Covalent
199 pm1.99 Å
van Der Waals
236 pm2.36 Å
Oxidation States
CommonRare
0
+2
+3
Crystal Structure
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Double Hexagonal close-packed