Arrange the following ions in the decreasing order of their sizes and explain.
`Li^(+),K^(+),Mg^(2+),Al^(3+)`

Explanation

To arrange the ions \( \text{Li}^+, \text{K}^+, \text{Mg}^{2+}, \text{Al}^{3+} \) in decreasing order of their sizes, we can analyze their ionic radii based on the charge and the number of electrons in each ion. Here’s a step-by-step solution:

### Step 1: Identify the number of protons and electrons in each ion
- **Li\(^+\)**:
- Protons: 3
- Electrons: 2 (loses 1 electron)

- **K\(^+\)**:
...