The table gives the nuclear notation for four nuclei, P, Q, R and S. X\mathrm{X}X is used in place of each element symbol.
| Nucleus | Nuclear notation |
|---|---|
| P | 1632X{}^{32}_{16}\mathrm{X}1632X |
| Q | 1634X{}^{34}_{16}\mathrm{X}1634X |
| R | 1734X{}^{34}_{17}\mathrm{X}1734X |
| S | 1836X{}^{36}_{18}\mathrm{X}1836X |
What is the total number of neutrons in the two nuclei that are isotopes of each other?
35 neutrons
34 neutrons
66 neutrons
32 neutrons