Question

Which isotope is likely to be most stable?

• A. ${}_{30}Zn^{66}$
• B. ${} _{30}Zn^{64}$
• C. ${}_{30}Zn^{71}$
• D. none

Answer 1

Answer: (B)

${} _{30}Zn^{64}$

Answer 2

For ${ }_{30} Z n_{34}^{64} p=30, n=34, \frac{n}{p}=1.13$ Lesser the value of $n / p$, more stable will be the isotope.