Match the column: Column I (Isotope) with Column II (Characteristic) — Nuclear Chemistry and Radioactivity Chemistry Question

💡 Solution & Explanation

${}_{20}^{40}\text{Ca}$ has magic numbers of both protons and neutrons (20, 20) and is highly stable (A $\to$ S). The stable isotope of Iodine is typically ${}_{53}^{127}\text{I}$. ${}_{53}^{133}\text{I}$ is neutron-rich and therefore a beta emitter (B $\to$ Q). ${}_{53}^{121}\text{I}$ is neutron-deficient and therefore a positron emitter or undergoes electron capture (C $\to$ R). ${}_{90}^{232}\text{Th}$ is a heavy radioactive nuclide that primarily decays via alpha emission (D $\to$ P). Therefore, correct answer is A-S; B-Q; C-R; D-P.