Tb
Terbium
Z 65 158.925 g/molLanthanide
Nucleus
65 Protons
94 Neutrons
65 Electrons (3 Valence)
Shell distribution: K2 • L8 • M18 • N27 • 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]4f96s2
Oxidation States
CommonRare
0
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Radii
Empirical
175 pm1.75 Å
Calculated
225 pm2.25 Å
Covalent
194±5 pm1.94±0.05 Å
Van der Waals
221 pm2.21 Å
IonicTb3+
92.3 pm0.923 Å
Crystal Structure
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Hexagonal close-packedStandard state
Pearson symbol
hP2
Space group
P63/mmc No. 194
Density
8.23 g/cm³