Xenon vs Cesium
Side-by-side comparison of Xenon (Xe, element 54) and Cesium (Cs, element 55) by atomic structure and physical properties.
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| Atomic number | 54 | 55 |
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| Symbol | Xe | Cs |
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| Name | Xenon | Cesium |
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| Category | noble-gas | alkali-metal |
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| Standard Atomic Weight | 131.293 u | 132.905452 u |
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| Period | 5 | 6 |
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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 | [Kr]4d105s25p6 | [Xe]6s1 |
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| Oxidation states | [0, 2, 4, 6, 8] | [-1, 1] |
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| Electronegativity (Pauling) | 2.6 | 0.79 |
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| Electron affinity | -0.8 eV | 0.4716 eV |
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| Density | 5.887 kg/m³ | 1930 kg/m³ |
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| Melting point | -111.79 °C | 28.44 °C |
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| Boiling point | -108.1 °C | 670.85 °C |
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| Discovery year | 1898 | 1860 |
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Key Differences
| Xe Xenon | Cs Cesium |
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| Standard Atomic Weight | 131.293 u ↓ lower | 132.905452 u ↑ higher |
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| Density | 5.887 kg/m³ ↓ lower | 1930 kg/m³ ↑ higher |
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| Melting point | -111.79 °C ↓ lower | 28.44 °C ↑ higher |
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| Boiling point | -108.1 °C ↓ lower | 670.85 °C ↑ higher |
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| Electronegativity (Pauling) | 2.6 ↑ higher | 0.79 ↓ lower |
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| Electron affinity | -0.8 eV ↓ lower | 0.4716 eV ↑ higher |
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| Period | 5 | 6 |
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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 | [Kr]4d105s25p6 | [Xe]6s1 |
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| Discovery year | 1898 | 1860 |
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