Hafnium vs Thallium
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| Atomic number | 72 | 81 |
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| Symbol | Hf | Tl |
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| Name | Hafnium | Thallium |
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| Category | transition-metal | post-transition-metal |
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| Standard Atomic Weight | 178.49 u | 204.3835 u |
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| Period | 6 | 6 |
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| Group | 4 | 13 |
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| Block | s | p |
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| Phase at STP | solid | solid |
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| Electron configuration | [Xe]6s24f145d2 | [Xe]6s24f145d106p1 |
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| Oxidation states | [-2, 0, 1, 2, 3, 4] | [-5, -2, -1, 1, 2, 3] |
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| Electronegativity (Pauling) | 1.3 | 1.62 |
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| Electron affinity | 0.178 eV | 0.377 eV |
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| Density | 1.330000e+4 kg/m³ | 1.180000e+4 kg/m³ |
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| Melting point | 2232.85 °C | 303.85 °C |
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| Boiling point | 4602.85 °C | 1472.85 °C |
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| Discovery year | 1911 | 1861 |
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