A uranium nucleus $^{{238}}_{{92}}\text{U}$ undergoes decay to produce thorium by releasing an $\alpha$-particle. Thorium then decays into protactinium by releasing a $\beta$-particle. Which row shows the atomic number and mass number for this isotope of protactinium?
- Aatomic number 89, mass number 234
- Batomic number 90, mass number 235
- Catomic number 91, mass number 234
- Datomic number 95, mass number 235