Astatine vs Radon
Side-by-side comparison of Astatine (At, element 85) and Radon (Rn, element 86) by atomic structure and physical properties.
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| Atomic number | 85 | 86 |
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| Symbol | At | Rn |
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| Name | Astatine | Radon |
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| Category | halogen | noble-gas |
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| Standard Atomic Weight | 210 u | 222 u |
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| Period | 6 | 6 |
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| Group | 17 | 18 |
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| Block | p | p |
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| Phase at STP | Solid | Gas |
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| Electron configuration | [Xe]4f145d106s26p5 | [Xe]4f145d106s26p6 |
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| Oxidation states | [-1, 1, 3, 5, 7] | [0, 2, 6] |
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| Electronegativity (Pauling) | 2.2 | N/A |
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| Electron affinity | 2.391 eV | -0.7 eV |
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| Density | 7000 kg/m³ | 9.73 kg/m³ |
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| Melting point | 301.85 °C | -71.15 °C |
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| Boiling point | N/A | -61.7 °C |
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| Discovery year | 1940 | 1900 |
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Key Differences
| At Astatine | Rn Radon |
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| Standard Atomic Weight | 210 u ↓ lower | 222 u ↑ higher |
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| Density | 7000 kg/m³ ↑ higher | 9.73 kg/m³ ↓ lower |
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| Melting point | 301.85 °C ↑ higher | -71.15 °C ↓ lower |
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| Electron affinity | 2.391 eV ↑ higher | -0.7 eV ↓ lower |
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| Group | 17 | 18 |
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| Category | halogen | noble-gas |
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| Phase at STP | Solid | Gas |
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| Electron configuration | [Xe]4f145d106s26p5 | [Xe]4f145d106s26p6 |
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| Discovery year | 1940 | 1900 |
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