Francium vs Radium
Side-by-side comparison of Francium (Fr, element 87) and Radium (Ra, element 88) by atomic structure and physical properties.
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| Atomic number | 87 | 88 |
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| Symbol | Fr | Ra |
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| Name | Francium | Radium |
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| Category | alkali-metal | alkaline-earth-metal |
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| Standard Atomic Weight | 223 u | 226 u |
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| Period | 7 | 7 |
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| Group | 1 | 2 |
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| Block | s | s |
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| Phase at STP | Solid | Solid |
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| Electron configuration | [Rn]7s1 | [Rn]7s2 |
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| Oxidation states | [1] | [2] |
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| Electronegativity (Pauling) | 0.7 | 0.9 |
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| Electron affinity | 0.491 eV | 0.1 eV |
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| Density | 2480 kg/m³ | 5000 kg/m³ |
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| Melting point | 7.85 °C | 699.85 °C |
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| Boiling point | N/A | 1736.85 °C |
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| Discovery year | 1939 | 1898 |
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Key Differences
| Fr Francium | Ra Radium |
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| Standard Atomic Weight | 223 u ↓ lower | 226 u ↑ higher |
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| Density | 2480 kg/m³ ↓ lower | 5000 kg/m³ ↑ higher |
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| Melting point | 7.85 °C ↓ lower | 699.85 °C ↑ higher |
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| Electronegativity (Pauling) | 0.7 ↓ lower | 0.9 ↑ higher |
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| Electron affinity | 0.491 eV ↑ higher | 0.1 eV ↓ lower |
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| Group | 1 | 2 |
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| Category | alkali-metal | alkaline-earth-metal |
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| Electron configuration | [Rn]7s1 | [Rn]7s2 |
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| Discovery year | 1939 | 1898 |
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