Tl
Thallium
Z 81 204.38 g/molPost-Transition Metal
Nucleus
81 Protons
123 Neutrons
81 Electrons (3 Valence)
Shell distribution: K2 • L8 • M18 • N32 • O18 • P3 • Q0
Electron Configuration
Energy
7p
6d
5f
7s
6p
5d
4f
6s
5p
4d
5s
4p
3d
4s
3p
3s
2p
2s
1s
[Xe]4f145d106s26p1
Radii
Empirical
190 pm1.9 Å
Calculated
156 pm1.56 Å
Covalent
145±7 pm1.45±0.07 Å
van Der Waals
196 pm1.96 Å
Oxidation States
CommonRare
-5
-2
-1
0
+1
+2
+3
Crystal Structure
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Hexagonal close-packed