| Property | Value |
|---|---|
| Atomic number | 91 |
| Atomic weight | 231.035882 amu |
| Element family | Actinoids |
| Electronic configuration | 1s2 |
| Stable and very long lived isotopes | None |
| Previous element | Thorium |
| Next element | Uranium |
| Density | 15.37 g/cm3 (STP) |
| Melting | 1600 °C |
| Boiling | 4030 °C |
| Covalent radius | 1.69 Å |
| Ionic radius | 0.78 Å |
| Metallic radius | 1.63 Å |
| First ionization potential | 5.887 eV |
| Electron affinity | 0.550 eV |
| Electronegativity | 1.5 |
| Discovery year | 1913 |
| Sample compounds |
|---|
| PaI5 |
Protactinium is an element number 91 from actinoids family. Its symbol is Pa. Protactinium atomic weight is 231.035882 amu. Pa has no stable or long lived isotopes. Protactinium electronic configuration is 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p67s26d15f2. Sample compounds that contain Protactinium are PaI5.
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