The series (Neptunium series) is unique among the four disintegration series. Which of the following — Nuclear Chemistry and Radioactivity Chemistry Question

💡 Solution & Explanation

The Neptunium series ($4n+1$) is an artificially created series (starts with Pu-241/Np-237) and uniquely terminates at the stable isotope ${}_{83}^{209}Bi$, unlike the three natural series which all terminate at an isotope of Lead (${}_{82}Pb$).