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:

This is a positron ($e^+$) emission process, where a proton converts into a neutron. The atomic number $Z$ decreases by 1, and the mass number $A$ remains unchanged. Final $Z = 11 - 1 = 10$, and $A = 22$. The resulting nucleus is $^{22}_{10}Ne$.