Hydrogen vs Lithium
Side-by-side comparison of Hydrogen (H, element 1) and Lithium (Li, element 3) by atomic structure and physical properties.
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| Atomic number | 1 | 3 |
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| Symbol | H | Li |
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| Name | Hydrogen | Lithium |
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| Category | nonmetal | alkali-metal |
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| Standard Atomic Weight | 1.007975 u | 6.9675 u |
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| Period | 1 | 2 |
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| Group | 1 | 1 |
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| Block | s | s |
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| Phase at STP | Gas | Solid |
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| Electron configuration | 1s1 | [He]2s1 |
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| Oxidation states | [-1, 1] | [1] |
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| Electronegativity (Pauling) | 2.2 | 0.98 |
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| Electron affinity | 0.75419 eV | 0.61804 eV |
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| Density | 0.08988 kg/m³ | 534 kg/m³ |
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| Melting point | -259.193 °C | 180.5 °C |
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| Boiling point | -252.781 °C | 1341.85 °C |
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| Discovery year | 1766 | 1817 |
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Key Differences
| H Hydrogen | Li Lithium |
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| Standard Atomic Weight | 1.007975 u ↓ lower | 6.9675 u ↑ higher |
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| Density | 0.08988 kg/m³ ↓ lower | 534 kg/m³ ↑ higher |
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| Melting point | -259.193 °C ↓ lower | 180.5 °C ↑ higher |
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| Boiling point | -252.781 °C ↓ lower | 1341.85 °C ↑ higher |
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| Electronegativity (Pauling) | 2.2 ↑ higher | 0.98 ↓ lower |
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| Electron affinity | 0.75419 eV ↑ higher | 0.61804 eV ↓ lower |
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| Period | 1 | 2 |
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| Category | nonmetal | alkali-metal |
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| Phase at STP | Gas | Solid |
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| Electron configuration | 1s1 | [He]2s1 |
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| Discovery year | 1766 | 1817 |
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