A uranium nucleus ₉₂ U ²³⁸ emits an α-particle and a β-particle in succession.

A uranium nucleus ₉₂ U ²³⁸ emits an α-particle and a β-particle in succession. The atomic number and mass number of the final nucleus will be

(a) 90233
(b) 90238
(c) 91238
(d) 91234

91234

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