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| Atomic Number | 66 |
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| Atomic Symbol | Dy |
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| Atomic Weight | 162.50 amu |
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| Group | Rare Earth (Lanthanide Series) |
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| Form | Solid |
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| Density @ STP | 8.55 g/cm3 |
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| Melting Point | 1412 °C (2573.6 °F, 1685.15 °K) |
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| Boiling Point | 2567 °C (4652.6 °F, 2840.15 °K) |
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| Heat of Fusion | 11.06 kJ/mol |
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| Heat of Vaporization | 280 kJ/mol |
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| First Ionization Potential | 5.9389 eV |
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| Electronegativity (on Pauling scale) | 1.22 |
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| Specific Heat Capacity | 0.170 J/g K |
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| Ground State Electron Configuration | 4f10 5s2 5p6 6s2 |
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| Oxidation States | +3 |
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| Stable Isotopes and Natural Abundance on Earth | 156Dy, 0.06%; 158Dy, 0.10%; 160Dy, 2.34%; 161Dy, 18.9%; 162Dy, 25.5%; 163Dy, 24.9%; 164Dy, 28.2% |
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| Selected Radioisotopes | 165Dy, 166Dy |
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| Atomic Radius | 228 pm |
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| Crystal Structure | Hexagonal |
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| Discovered by | Lecoq de Boisbaudran, 1886
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