Indium vs Thallium
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| Atomic number | 49 | 81 |
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| Symbol | In | Tl |
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| Name | Indium | Thallium |
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| Category | post-transition-metal | post-transition-metal |
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| Standard Atomic Weight | 114.818 u | 204.3835 u |
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| Period | 5 | 6 |
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| Group | 13 | 13 |
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| Block | p | p |
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| Phase at STP | solid | solid |
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| Electron configuration | [Kr]5s24d105p1 | [Xe]6s24f145d106p1 |
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| Oxidation states | [-5, -2, -1, 0, 1, 2, 3] | [-5, -2, -1, 1, 2, 3] |
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| Electronegativity (Pauling) | 1.78 | 1.62 |
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| Electron affinity | 0.3 eV | 0.377 eV |
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| Density | 7310 kg/m³ | 1.180000e+4 kg/m³ |
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| Melting point | 156.6 °C | 303.85 °C |
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| Boiling point | 2071.85 °C | 1472.85 °C |
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| Discovery year | 1863 | 1861 |
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