| Protactinium |
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| Atomic Number - | 91 | Melting Point (°C,°F) - | 935 °C, 1715 °F |
| Atomic Symbol - | Pa | Boiling Point (°C,°F) - | 3520 °C, 6368 °F |
| Atomic Mass - | 231.04 | Electron Configuration - | [Rn] 5f2 6d1 7s2 |
| Group - | N/A | Electrons Per Shell - | 2, 8, 18, 32, 20, 9, 2 |
| Period - | 9 | Protons - | 91 |
| Series - | The Actinides | Neutrons - | 140 |
| Block - | s-block | | |
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Element Description - Praseodymium is a chemical element in the periodic table that has the symbol Pr and atomic number 59. |
Element Characteristics - Protactinium is a silver metallic element that belongs to the actinide group, with a bright metallic luster that it retains for some time in the air. It is superconductive at temperatures below 1.4 K. |
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