A) \[_{93}^{238}Np\]
B) \[_{90}^{234}Th\]
C) \[_{91}^{234}Pa\]
D) \[_{92}^{234}U\]
Correct Answer: B
Solution :
During a-decay, the atomic mass reduces by 4 units while atomic number decreases by 2 units. Thus,\[_{92}^{238}U\xrightarrow{-\alpha {{(}_{2}}H{{e}^{4}})}\,_{90}^{234}Th\]
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