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| Atomic Number | 18 |
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| Atomic Symbol | Ar |
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| Atomic Weight | 39.948 amu |
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| Group | Noble Gas, 18 |
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| Form | Gas |
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| Density @ STP | 1.756 g/L |
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| Melting Point | -189.35 °C (-308.83 °F, 83.8 °K) |
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| Boiling Point | -185.85°C (-302.53 °F, 87.3 °K) |
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| Heat of Fusion | 1.12 kJ/mol |
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| Heat of Vaporization | 6.43 kJ/mol |
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| First Ionization Potential | 15.75962 eV |
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| Specific Heat Capacity | 0.520 J/g K |
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| Ground State Electron Configuration | 3p6 |
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| Oxidation States | 0 |
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| Stable Isotopes and Natural Abundance on Earth | 36Ar, 0.337%; 38Ar, 0.063%; 40Ar, 99.600% |
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| Atomic Radius | 71 pm |
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| Crystal Structure | Cubic |
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| Discovered by | Ramsay; Rayleigh, 1894 |
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