Am
Americium
Z 95 243.0 g/molActinide Radioactive
Nucleus
95 Protons
148 Neutrons
95 Electrons (2 Valence)
Shell distribution: K2 • L8 • M18 • N32 • O25 • 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]5f77s2
Radii
Empirical
175 pm1.75 Å
Calculated
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Covalent
180±6 pm1.8±0.06 Å
van Der Waals
244 pm2.44 Å
Oxidation States
CommonRare
0
+2
+3
+4
+5
+6
+7
Crystal Structure
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Double Hexagonal close-packed