Cesium vs Barium
Side-by-side comparison of Cesium (Cs, element 55) and Barium (Ba, element 56) by atomic structure and physical properties.
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| Atomic number | 55 | 56 |
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| Symbol | Cs | Ba |
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| Name | Cesium | Barium |
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| Category | alkali-metal | alkaline-earth-metal |
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| Standard Atomic Weight | 132.905452 u | 137.327 u |
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| Period | 6 | 6 |
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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 | [Xe]6s1 | [Xe]6s2 |
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| Oxidation states | [-1, 1] | [1, 2] |
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| Electronegativity (Pauling) | 0.79 | 0.89 |
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| Electron affinity | 0.4716 eV | 0.1447 eV |
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| Density | 1930 kg/m³ | 3620 kg/m³ |
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| Melting point | 28.44 °C | 726.85 °C |
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| Boiling point | 670.85 °C | 1896.85 °C |
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| Discovery year | 1860 | 1808 |
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Key Differences
| Cs Cesium | Ba Barium |
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| Standard Atomic Weight | 132.905452 u ↓ lower | 137.327 u ↑ higher |
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| Density | 1930 kg/m³ ↓ lower | 3620 kg/m³ ↑ higher |
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| Melting point | 28.44 °C ↓ lower | 726.85 °C ↑ higher |
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| Boiling point | 670.85 °C ↓ lower | 1896.85 °C ↑ higher |
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| Electronegativity (Pauling) | 0.79 ↓ lower | 0.89 ↑ higher |
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| Electron affinity | 0.4716 eV ↑ higher | 0.1447 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 | [Xe]6s1 | [Xe]6s2 |
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| Discovery year | 1860 | 1808 |
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