Po
Polonium
Z 84 209.0 g/molMetalloid Radioactive
Nucleus
84 Protons
125 Neutrons
84 Electrons (6 Valence)
Shell distribution: K2 • L8 • M18 • N32 • O18 • P6 • Q0
Electron Configuration
Energy
7p
6d
5f
7s
6p
5d
4f
6s
5p
4d
5s
4p
3d
4s
3p
3s
2p
2s
1s
[Xe]4f145d106s26p4
Oxidation States
CommonRare
0
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Radii
Empirical
190 pm1.9 Å
Calculated
135 pm1.35 Å
Covalent
140±4 pm1.4±0.04 Å
Van der Waals
197 pm1.97 Å
IonicPo4+
94 pm0.94 Å
Crystal Structure
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CubicStandard state
Pearson symbol
cP1
Space group
Pm3m No. 221
Density
9.196 g/cm³