Oxygen vs Fluorine
Side-by-side comparison of Oxygen (O, element 8) and Fluorine (F, element 9) by atomic structure and physical properties.
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| Atomic number | 8 | 9 |
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| Symbol | O | F |
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| Name | Oxygen | Fluorine |
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| Category | nonmetal | halogen |
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| Standard Atomic Weight | 15.9994 u | 18.998403 u |
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| Period | 2 | 2 |
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| Group | 16 | 17 |
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| Block | p | p |
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| Phase at STP | Gas | Gas |
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| Electron configuration | [He]2s22p4 | [He]2s22p5 |
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| Oxidation states | [-2, -1, 0, 1, 2] | -1 |
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| Electronegativity (Pauling) | 3.44 | 3.98 |
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| Electron affinity | 1.4611 eV | 3.4011 eV |
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| Density | 1.429 kg/m³ | 1.696 kg/m³ |
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| Melting point | -218.79 °C | -219.62 °C |
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| Boiling point | -182.95 °C | -188.12 °C |
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| Discovery year | 1771 | 1886 |
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Key Differences
| O Oxygen | F Fluorine |
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| Standard Atomic Weight | 15.9994 u ↓ lower | 18.998403 u ↑ higher |
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| Density | 1.429 kg/m³ ↓ lower | 1.696 kg/m³ ↑ higher |
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| Melting point | -218.79 °C ↑ higher | -219.62 °C ↓ lower |
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| Boiling point | -182.95 °C ↑ higher | -188.12 °C ↓ lower |
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| Electronegativity (Pauling) | 3.44 ↓ lower | 3.98 ↑ higher |
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| Electron affinity | 1.4611 eV ↓ lower | 3.4011 eV ↑ higher |
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| Group | 16 | 17 |
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| Category | nonmetal | halogen |
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| Electron configuration | [He]2s22p4 | [He]2s22p5 |
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| Discovery year | 1771 | 1886 |
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