Krypton vs Rubidium
Side-by-side comparison of Krypton (Kr, element 36) and Rubidium (Rb, element 37) by atomic structure and physical properties.
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| Atomic number | 36 | 37 |
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| Symbol | Kr | Rb |
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| Name | Krypton | Rubidium |
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| Category | noble-gas | alkali-metal |
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| Standard Atomic Weight | 83.798 u | 85.4678 u |
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| Period | 4 | 5 |
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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 | [Ar]3d104s24p6 | [Kr]5s1 |
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| Oxidation states | [0, 1, 2] | [-1, 1] |
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| Electronegativity (Pauling) | 3 | 0.82 |
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| Electron affinity | -1 eV | 0.4859 eV |
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| Density | 3.733 kg/m³ | 1530 kg/m³ |
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| Melting point | -157.36 °C | 39.31 °C |
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| Boiling point | -153.42 °C | 687.85 °C |
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| Discovery year | 1898 | 1861 |
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Key Differences
| Kr Krypton | Rb Rubidium |
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| Standard Atomic Weight | 83.798 u ↓ lower | 85.4678 u ↑ higher |
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| Density | 3.733 kg/m³ ↓ lower | 1530 kg/m³ ↑ higher |
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| Melting point | -157.36 °C ↓ lower | 39.31 °C ↑ higher |
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| Boiling point | -153.42 °C ↓ lower | 687.85 °C ↑ higher |
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| Electronegativity (Pauling) | 3 ↑ higher | 0.82 ↓ lower |
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| Electron affinity | -1 eV ↓ lower | 0.4859 eV ↑ higher |
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| Period | 4 | 5 |
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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 | [Ar]3d104s24p6 | [Kr]5s1 |
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| Discovery year | 1898 | 1861 |
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