Nucleus: Practice Problem & Solution

Solution Explained:

To solve this problem, we apply the core principles of Nucleus. Understanding the underlying formula is key to arriving at the correct answer below:

Step 1: $Z \rightarrow Z-1$ indicates $\beta^+$ decay. Step 2: $Z-1 \rightarrow Z-3$ indicates a decrease of 2, which is $\alpha$ decay. Step 3: $Z-3 \rightarrow Z-2$ indicates an increase of 1, which is $\beta^-$ decay. The sequence is $\beta^+, \alpha, \beta^-$.