Arrange the order of decreasing/increasing properties given below:
1. Decreasing order of atomic and ionic radii
a. `Mg^(2+), O^(2-), Na^(o+), F^(ɵ)`

Explanation

To arrange the ions `Mg^(2+)`, `O^(2-)`, `Na^(+)`, and `F^(−)` in decreasing order of atomic and ionic radii, we can follow these steps:

### Step 1: Identify the Ions and Their Electron Configuration
All four ions are isoelectronic, meaning they all have the same number of electrons (10 electrons). The ions are:
- `Mg^(2+)`: 10 electrons (12 protons)
- `Na^(+)`: 10 electrons (11 protons)
- `F^(−)`: 10 electrons (9 protons)
- `O^(2-)`: 10 electrons (8 protons)
...