| Promethium |
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| Atomic Number - | 61 | Melting Point (°C,°F) - | 1042 °C, 1908 °F |
| Atomic Symbol - | Pm | Boiling Point (°C,°F) - | 3000 °C, 5432 °F |
| Atomic Mass - | (147) | Electron Configuration - | [Xe] 4f5 6s2 |
| Group - | N/A | Electrons Per Shell - | 2, 8, 18, 23, 8, 2 |
| Period - | 8 | Protons - | 61 |
| Series - | The Lanthanides | Neutrons - | 84 |
| Block - | s-block | | |
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Element Description - Promethium is a chemical element in the periodic table that has the symbol Pm and atomic number 61. |
Element Characteristics - Promethium has no stable isotopes. It is a man-made soft beta emitter; it does not emit gamma rays, but beta particles impinging on elements of high atomic numbers can generate X-rays. Pure promethium exists in two allotropic forms, but little else is known about the metal. Promethium salts luminesce in the dark with a pale blue or greenish glow due to their high radioactivity. |
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