At
Astatine
Z 85 210.0 g/molMetalloid Radioactive
Nucleus
85 Protons
125 Neutrons
85 Electrons (7 Valence)
Shell distribution: K2 • L8 • M18 • N32 • O18 • P7 • Q0
Electron Configuration
Energy
7p
6d
5f
7s
6p
5d
4f
6s
5p
4d
5s
4p
3d
4s
3p
3s
2p
2s
1s
[Xe]4f145d106s26p5
Radii
Empirical
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Calculated
127 pm1.27 Å
Covalent
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van Der Waals
202 pm2.02 Å
Oxidation States
CommonRare
-1
0
+1
+3
+5
+7
Crystal Structure
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Face-centered Cubic