A) \[_{36}K{{r}^{84}}\]
B) \[_{37}R{{b}^{85}}\]
C) \[_{38}S{{r}^{87}}\]
D) \[_{39}{{Y}^{89}}\]
Correct Answer: C
Solution :
Isotones are the species which have same number of neutrons and different number of nucleons (p + n).
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