Isotopes of protactinium

Protactinium (Pa) has several isotopes, but the most notable ones are: 1. **Protactinium-231 (Pa-231)**: This is the most stable and widely recognized isotope of protactinium. It has a half-life of about 32,760 years and is produced from the decay of uranium-235. It is used in various scientific research applications, including studies related to nuclear chemistry and geology.