A) \[_{34}S{{e}^{74}},\,{{\,}_{31}}C{{a}^{71}}\]
B) \[_{42}M{{o}^{92}},\,{{\,}_{40}}Z{{r}^{92}}\]
C) \[_{38}S{{r}^{81}},\,{{\,}_{38}}S{{r}^{86}}\]
D) \[_{20}C{{a}^{40}},\,{{\,}_{16}}{{S}^{32}}\]
Correct Answer: A
Solution :
These nuclei having different Z and A but equal (A ? Z) are called isotones.
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