A) \[_{\text{34}}\text{S}{{\text{e}}^{\text{74}}}{{\text{,}}_{\text{31}}}\text{G}{{\text{a}}^{\text{71}}}\]
B) \[_{\text{42}}\text{M}{{\text{o}}^{\text{92}}}{{\text{,}}_{\text{40}}}\text{Z}{{\text{r}}^{\text{92}}}\]
C) \[_{\text{38}}\text{S}{{\text{r}}^{\text{84}}}{{\text{,}}_{\text{38}}}\text{S}{{\text{r}}^{\text{86}}}\]
D) \[_{\text{20}}\text{C}{{\text{a}}^{\text{40}}}{{\text{,}}_{\text{16}}}{{\text{S}}^{\text{32}}}\]
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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