| Actinium |
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| Atomic Number - | 89 | Melting Point (°C,°F) - | 1050 °C, 1922 °F |
| Atomic Symbol - | Ac | Boiling Point (°C,°F) - | 3198 °C, 5788 °F |
| Atomic Mass - | (227.03) | Electron Configuration - | [Rn] 6d1 7s2 |
| Group - | 3 | Electrons Per Shell - | 2, 8, 18, 32, 18, 9, 2 |
| Period - | 7 | Protons - | 89 |
| Series - | The Actinides | Neutrons - | 138 |
| Block - | s-block | | |
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Element Description - Actinium is a chemical element in the periodic table that has the symbol Ac and atomic number 89. |
Element Characteristics - Actinium is a silvery radioactive metallic element. Due to its intense radioactivity, Actinium glows in the dark with an eerie blue light. It is found only in traces in uranium ores as 227-Ac, an α and β emitter with a half-life of 21.773 years. One ton of uranium ore contains about a tenth of a gram of actinium. |
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