question_answer

The set of nuclei that are isotonic is (a) \[_{6}{{C}^{12}}{{,}_{7}}{{N}^{14}}{{,}_{8}}{{O}^{16}}\]            (b) \[_{6}{{C}^{14}}{{,}_{7}}{{N}^{15}}{{,}_{8}}{{O}^{16}}\] (c) \[_{6}{{C}^{14}}{{,}_{7}}{{N}^{14}}{{,}_{8}}{{O}^{18}}\]            (d) \[_{6}{{C}^{14}}{{,}_{7}}{{N}^{15}}{{,}_{8}}{{O}^{18}}\]

Answer:

\[_{6}{{C}^{14}},{{\text{ }}_{7}}{{N}^{15}},{{\text{ }}_{8}}{{O}^{16}}\]are isotonic as they contain same number of neutrons. i.e., 8.