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| Atomic Number | 56 |
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| Atomic Symbol | Ba |
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| Atomic Weight | 137.327 amu |
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| Group | Alkaline Earth, 2 |
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| Form | Solid |
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| Density @ STP | 3.62 g/cm3 |
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| Melting Point | 727 °C (1340.6 °F, 1000.15 °K) |
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| Boiling Point | 1897 °C (3446.6 °F, 2170.15 °K) |
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| Heat of Fusion | 7.12 kJ/mol |
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| Heat of Vaporization | 140 kJ/mol |
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| First Ionization Potential | 5.21170 eV |
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| Electronegativity (on Pauling scale) | 0.89 |
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| Specific Heat Capacity | 0.204 J/g K |
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| Ground State Electron Configuration | 5p6 6s2 |
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| Oxidation States | +2 |
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| Stable Isotopes and Natural Abundance on Earth | 130Ba, 0.106%; 132Ba, 0.101%; 134Ba, 2.417%; 135Ba, 6.592%; 136Ba, 7.854%; 137Ba, 11.23%; 138Ba, 71.70% |
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| Selected Radioisotopes | 133Ba, 140Ba |
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| Atomic Radius | 253 pm |
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| Crystal Structure | Cubic |
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| Discovered by | Davy, 1808 |
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