Q. The nuclei of which of the following pairs of nuclei are isotones
A) $\ _{34}Se^{74},\ \ _{31}Ca^{71}$
B) $\ _{42}Mo^{92},\ \ _{40}Zr^{92}$
C) $\ _{38}{Sr}^{81},\ \ _{38}{Sr}^{86}$
D) $\ _{20}Ca^{40},\ \ _{16}S^{32}$
Explanation
(a) The nuclei having different $Z$ and $A$ but equal $(A - Z)$ are called isotones
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.