Bromine vs Krypton
Side-by-side comparison of Bromine (Br, element 35) and Krypton (Kr, element 36) by atomic structure and physical properties.
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| Atomic number | 35 | 36 |
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| Symbol | Br | Kr |
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| Name | Bromine | Krypton |
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| Category | halogen | noble-gas |
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| Standard Atomic Weight | 79.904 u | 83.798 u |
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| Period | 4 | 4 |
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| Group | 17 | 18 |
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| Block | p | p |
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| Phase at STP | Liquid | Gas |
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| Electron configuration | [Ar]3d104s24p5 | [Ar]3d104s24p6 |
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| Oxidation states | [-1, 1, 2, 3, 4, 5, 7] | [0, 1, 2] |
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| Electronegativity (Pauling) | 2.96 | 3 |
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| Electron affinity | 3.3635 eV | -1 eV |
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| Density | 3102.8 kg/m³ | 3.733 kg/m³ |
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| Melting point | -7.2 °C | -157.36 °C |
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| Boiling point | 58.8 °C | -153.42 °C |
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| Discovery year | 1825 | 1898 |
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Key Differences
| Br Bromine | Kr Krypton |
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| Standard Atomic Weight | 79.904 u ↓ lower | 83.798 u ↑ higher |
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| Density | 3102.8 kg/m³ ↑ higher | 3.733 kg/m³ ↓ lower |
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| Melting point | -7.2 °C ↑ higher | -157.36 °C ↓ lower |
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| Boiling point | 58.8 °C ↑ higher | -153.42 °C ↓ lower |
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| Electronegativity (Pauling) | 2.96 ↓ lower | 3 ↑ higher |
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| Electron affinity | 3.3635 eV ↑ higher | -1 eV ↓ lower |
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| Group | 17 | 18 |
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| Category | halogen | noble-gas |
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| Phase at STP | Liquid | Gas |
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| Electron configuration | [Ar]3d104s24p5 | [Ar]3d104s24p6 |
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| Discovery year | 1825 | 1898 |
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