Bk
Berkelium
Z 97 247.0 g/molActinide Radioactive
Nucleus
97 Protons
150 Neutrons
97 Electrons (4 Valence)
Shell distribution: K2 • L8 • M18 • N32 • O27 • P8 • Q2
Electron Configuration
Energy
7p
6d
5f
7s
6p
5d
4f
6s
5p
4d
5s
4p
3d
4s
3p
3s
2p
2s
1s
[Rn]5f97s2
Oxidation States
CommonRare
0
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Radii
Empirical
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Calculated
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Covalent
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Van der Waals
244 pm2.44 Å
IonicBk3+
98 pm0.98 Å
Crystal Structure
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Double hexagonal close-packedStandard state
Pearson symbol
hP4
Space group
P63/mmc No. 194
Density
14.78 g/cm³