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| Atomic Number | 17 |
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| Atomic Symbol | Cl |
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| Atomic Weight | 35.4527 amu |
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| Group | Halogen, 17 |
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| Form | Gas |
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| Density @ STP | 3.111 g/L |
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| Melting Point | -101.5 °C (-150.7 °F, 171.7 °K) |
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| Boiling Point | -34.04 °C (-29.27 °F, 239.11 °K) |
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| Heat of Fusion | 6.40 kJ/mol |
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| Heat of Vaporization | 20.41 kJ/mol |
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| First Ionization Potential | 12.96764 eV |
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| Electronegativity (on Pauling scale) | 3.16 |
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| Specific Heat Capacity | 0.479 J/g K |
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| Ground State Electron Configuration | 3p5 |
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| Oxidation States | +1, +5, +7, -1 |
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| Stable Isotopes and Natural Abundance on Earth | 35Cl, 75.77%; 37Cl, 24.23% |
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| Atomic Radius | 79 pm |
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| Crystal Structure | Orthorhombic |
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| Discovered by | Scheele, 1774 |
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