A) \[_{34}S{{e}^{74}},{{\,}_{31}}G{{a}^{71}}\]
B) \[_{42}M{{o}^{92}}\,,{{\,}_{40}}Z{{r}^{92}}\]
C) \[_{38}S{{r}^{84}},{{\,}_{38}}S{{r}^{86}}\]
D) \[_{20}C{{a}^{40}},\,{{\,}_{16}}{{S}^{32}}\]
Correct Answer: A
Solution :
The nuclei which have same number of neutrons but different atomic number and mass number are known as isotones. In choice (a) nuclei of \[_{34}S{{e}^{74}}\,\,and{{\,}_{31}}G{{a}^{71}}\,\]are isotones as \[A-Z=74-34=71-31=40\]
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