Eu
Europium
Z 63 151.964 g/molLanthanide
Nucleus
63 Protons
89 Neutrons
63 Electrons (3 Valence)
Shell distribution: K2 • L8 • M18 • N25 • 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]4f76s2
Oxidation States
CommonRare
0
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Radii
Empirical
185 pm1.85 Å
Calculated
231 pm2.31 Å
Covalent
198±6 pm1.98±0.06 Å
Van der Waals
233 pm2.33 Å
IonicEu2+
117 pm1.17 Å
Crystal Structure
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Body-centered cubic
Pearson symbol
cI2
Space group
Im3m No. 229