Nuclear Chemistry - Result Question 14
####14. Statement I Nuclide ${ } _{13}^{30} Al$ is less stable than ${ } _{20}^{40} Ca$.
Statement II Nuclides having odd number of protons and neutrons are generally unstable.
(1998)
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Answer:
Correct Answer: 14. $(a, b)$
Solution:
- Upto atomic number of 20 , stable nuclei possess neutron to proton ratio $(n / p)=1$.
$$ \begin{aligned} & \frac{n}{p}\left({ } _{13} Al^{30}\right)=\frac{17}{13}=1.3>1, \text { unstable, } \beta \text {-emitters. } \ & \frac{n}{p}\left({ } _{20} Ca^{40}\right)=\frac{20}{20}=1, \text { stable. } \end{aligned} $$
Also, nuclei with both neutrons and protons odd are usually unstable but it does not explain the assertion appropriately.
