The table below shows information about four different nuclei.
| Thorium-228 | Protactinium-231 | Uranium-232 | Uranium-235 |
|---|---|---|---|
| 90228Th{}^{228}_{90}\text{Th}90228Th | 91231Pa{}^{231}_{91}\text{Pa}91231Pa | 92232U{}^{232}_{92}\text{U}92232U | 92235U{}^{235}_{92}\text{U}92235U |
Which two nuclei have the same number of neutrons?
Thorium-228 and protactinium-231
Protactinium-231 and uranium-232
Uranium-232 and uranium-235
Thorium-228 and uranium-232