Pa
Protactinium
Z = 91 · Actinide · 231.0 u
Basic properties
- Atomic number (Z)
- 91
- Standard atomic mass
- 231.0 u
- Category
- Actinide
Isotopes & cross-section data
| Isotope | Mass (A) | Half-life | ZAID | Libraries |
|---|---|---|---|---|
| Pa-231 | 231 | 3.276e4 y | 91231 | .80c.71c.70c |
| Pa-233 | 233 | 26.975 d | 91233 | .80c.71c |