Hydrogen vs Oxygen
Side-by-side comparison of Hydrogen (H, element 1) and Oxygen (O, element 8) by atomic structure and physical properties.
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| Atomic number | 1 | 8 |
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| Symbol | H | O |
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| Name | Hydrogen | Oxygen |
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| Category | nonmetal | nonmetal |
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| Standard Atomic Weight | 1.007975 u | 15.9994 u |
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| Period | 1 | 2 |
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| Group | 1 | 16 |
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| Block | s | p |
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| Phase at STP | Gas | Gas |
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| Electron configuration | 1s1 | [He]2s22p4 |
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| Oxidation states | [-1, 1] | [-2, -1, 0, 1, 2] |
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| Electronegativity (Pauling) | 2.2 | 3.44 |
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| Electron affinity | 0.75419 eV | 1.4611 eV |
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| Density | 0.08988 kg/m³ | 1.429 kg/m³ |
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| Melting point | -259.193 °C | -218.79 °C |
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| Boiling point | -252.781 °C | -182.95 °C |
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| Discovery year | 1766 | 1771 |
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Key Differences
| H Hydrogen | O Oxygen |
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| Standard Atomic Weight | 1.007975 u ↓ lower | 15.9994 u ↑ higher |
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| Density | 0.08988 kg/m³ ↓ lower | 1.429 kg/m³ ↑ higher |
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| Melting point | -259.193 °C ↓ lower | -218.79 °C ↑ higher |
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| Boiling point | -252.781 °C ↓ lower | -182.95 °C ↑ higher |
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| Electronegativity (Pauling) | 2.2 ↓ lower | 3.44 ↑ higher |
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| Electron affinity | 0.75419 eV ↓ lower | 1.4611 eV ↑ higher |
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| Period | 1 | 2 |
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| Group | 1 | 16 |
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| Block | s | p |
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| Electron configuration | 1s1 | [He]2s22p4 |
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| Discovery year | 1766 | 1771 |
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