Why `Al^(3+)` is the only stable oxidation state of `Al` in its compounds while `Tl` has `+1` and `+3` oxidation states?

Explanation

To understand why \( \text{Al}^{3+} \) is the only stable oxidation state of aluminum (Al) in its compounds, while thallium (Tl) can exhibit both \( +1 \) and \( +3 \) oxidation states, we need to analyze the electronic configurations and the stability of these oxidation states.

### Step-by-Step Solution:

1. **Identify the Electronic Configurations:**
- Aluminum (Al) has the electronic configuration:
\[
\text{[Ne]} \, 3s^2 \, 3p^1
...