Question

Select One Option correct from the following: Masses of two isobars $_{29}Cu^{64}$ and $_{30}Zn^{64 }$ are 63.9298 u and 63.9292 u respectively. It can be concluded from these data that
(A) both the isobars are stable.
(B) $Zn^64 is radioactive, decaying to Cu^64 through \beta-decay.$
(C) $Cu^64 is radioactive, decaying to Zn^64 through \gamma-decay.$
(D) $Cu^64 is radioactive, decaying to Zn^64 through \beta-decay.$

Answer 1

IT'S option A

isobars have same mass number but different atomic number

hope this ans helps you...