Characteristics of the element
| Symbol: Pa |
| Name: Protactinium |
| Latin name: Protactinium |
| Atomic number: 91 |
| Atomic mass: 231,03588 |
| Melting point: 1568 (°C) |
| Boiling point: 4030 (°C) |
| Density 15,37 (g/cm 3 ) |
| Electronegativity: 1,1 |
| Oxidation number: V |
| Number of neutrons: 140 |
| Crystal structure: Orthorhombic |
| Chemical serie: Rare earth elements |
| Color: ----- |
| Electron configuration: 2-8-18-32-20-9-2 |
| Year of discovery:: 1917 |
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Update: 26.11.25
Update: 26.11.25