Radon vs Francium
Side-by-side comparison of Radon (Rn, element 86) and Francium (Fr, element 87) by atomic structure and physical properties.
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| Atomic number | 86 | 87 |
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| Symbol | Rn | Fr |
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| Name | Radon | Francium |
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| Category | noble-gas | alkali-metal |
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| Standard Atomic Weight | 222 u | 223 u |
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| Period | 6 | 7 |
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| Group | 18 | 1 |
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| Block | p | s |
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| Phase at STP | Gas | Solid |
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| Electron configuration | [Xe]4f145d106s26p6 | [Rn]7s1 |
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| Oxidation states | [0, 2, 6] | [1] |
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| Electronegativity (Pauling) | N/A | 0.7 |
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| Electron affinity | -0.7 eV | 0.491 eV |
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| Density | 9.73 kg/m³ | 2480 kg/m³ |
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| Melting point | -71.15 °C | 7.85 °C |
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| Boiling point | -61.7 °C | N/A |
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| Discovery year | 1900 | 1939 |
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Key Differences
| Rn Radon | Fr Francium |
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| Standard Atomic Weight | 222 u ↓ lower | 223 u ↑ higher |
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| Density | 9.73 kg/m³ ↓ lower | 2480 kg/m³ ↑ higher |
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| Melting point | -71.15 °C ↓ lower | 7.85 °C ↑ higher |
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| Electron affinity | -0.7 eV ↓ lower | 0.491 eV ↑ higher |
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| Period | 6 | 7 |
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| Group | 18 | 1 |
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| Block | p | s |
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| Category | noble-gas | alkali-metal |
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| Phase at STP | Gas | Solid |
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| Electron configuration | [Xe]4f145d106s26p6 | [Rn]7s1 |
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| Discovery year | 1900 | 1939 |
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