Starting from ²³⁸₉₂U, demonstrate by writing balanced nuclear reactions that the answer to Practice Problem 16.13 is correct.

Data from Problem 16.13

Positron emission moves us one step to the left in the periodic table, and alpha emission moves us two steps to the left. Does this mean that, for a given parent isotope, the daughter isotope resulting from two successive positron emissions is the same as the daughter isotope resulting from one alpha emission?