Cm
Curium
Z 96 247.0 g/molActinide Radioactive
Nucleus
96 Protons
151 Neutrons
96 Electrons (4 Valence)
Shell distribution: K2 • L8 • M18 • N32 • O25 • P9 • Q2
Electron Configuration
Energy
7p
6d
5f
7s
6p
5d
4f
6s
5p
4d
5s
4p
3d
4s
3p
3s
2p
2s
1s
[Rn]5f76d17s2
Oxidation States
CommonRare
0
Pick a state to see its ions
Radii
Empirical
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Calculated
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Covalent
169±3 pm1.69±0.03 Å
Van der Waals
245 pm2.45 Å
IonicCm3+
97 pm0.97 Å
Crystal Structure
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Double hexagonal close-packedStandard state
Pearson symbol
hP4
Space group
P63/mmc No. 194
Density
13.51 g/cm³