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| Atomic Number | 20 |
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| Atomic Symbol | Ca |
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| Atomic Weight | 40.078 amu |
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| Group | Alkaline Earth, 2 |
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| Form | Solid |
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| Density @ STP | 1.54 g/cm3 |
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| Melting Point | 842 °C (1547.6 °F, 1115.2 °K) |
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| Boiling Point | 1484 °C (2703.2 °F, 1757.2 °K) |
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| Heat of Fusion | 8.54 kJ/mol |
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| Heat of Vaporization | 155 kJ/mol |
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| First Ionization Potential | 6.11316 eV |
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| Electronegativity (on Pauling scale) | 1.00 |
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| Specific Heat Capacity | 0.647 J/g K |
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| Ground State Electron Configuration | 4s2 |
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| Oxidation States | +2 |
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| Stable Isotopes and Natural Abundance on Earth | 40Ca, 96.941%; 42Ca, 0.647%; 43Ca, 0.135%; 44Ca, 2.086%; 46Ca, 0.0004%; 48Ca, 0.187% |
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| Selected Radioisotopes | 45Ca; 47Ca |
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| Atomic Radius | 194 pm |
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| Crystal Structure | Cubic |
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| Discovered by | Davy, 1808
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