Fluorine vs Neon
Side-by-side comparison of Fluorine (F, element 9) and Neon (Ne, element 10) by atomic structure and physical properties.
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| Atomic number | 9 | 10 |
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| Symbol | F | Ne |
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| Name | Fluorine | Neon |
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| Category | halogen | noble-gas |
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| Standard Atomic Weight | 18.998403 u | 20.1797 u |
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| Period | 2 | 2 |
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| Group | 17 | 18 |
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| Block | p | p |
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| Phase at STP | Gas | Gas |
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| Electron configuration | [He]2s22p5 | [He]2s22p6 |
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| Oxidation states | -1 | [0] |
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| Electronegativity (Pauling) | 3.98 | N/A |
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| Electron affinity | 3.4011 eV | -1.2 eV |
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| Density | 1.696 kg/m³ | 0.8999 kg/m³ |
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| Melting point | -219.62 °C | -248.59 °C |
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| Boiling point | -188.12 °C | -246.05 °C |
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| Discovery year | 1886 | 1898 |
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Key Differences
| F Fluorine | Ne Neon |
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| Standard Atomic Weight | 18.998403 u ↓ lower | 20.1797 u ↑ higher |
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| Density | 1.696 kg/m³ ↑ higher | 0.8999 kg/m³ ↓ lower |
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| Melting point | -219.62 °C ↑ higher | -248.59 °C ↓ lower |
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| Boiling point | -188.12 °C ↑ higher | -246.05 °C ↓ lower |
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| Electron affinity | 3.4011 eV ↑ higher | -1.2 eV ↓ lower |
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| Group | 17 | 18 |
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| Category | halogen | noble-gas |
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| Electron configuration | [He]2s22p5 | [He]2s22p6 |
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| Discovery year | 1886 | 1898 |
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