For `Na^(+),Mg^(2+),F^(-) and O^(2-)`, the correct order of increasing ionic radii is :

Explanation

To determine the correct order of increasing ionic radii for the ions \( \text{Na}^+, \text{Mg}^{2+}, \text{F}^-, \) and \( \text{O}^{2-} \), we will follow these steps:

### Step 1: Identify the number of electrons in each ion
- **Sodium ion (\( \text{Na}^+ \))**: Sodium has an atomic number of 11. Losing one electron gives it 10 electrons.
- **Magnesium ion (\( \text{Mg}^{2+} \))**: Magnesium has an atomic number of 12. Losing two electrons gives it 10 electrons.
- **Fluoride ion (\( \text{F}^- \))**: Fluorine has an atomic number of 9. Gaining one electron gives it 10 electrons.
- **Oxide ion (\( \text{O}^{2-} \))**: Oxygen has an atomic number of 8. Gaining two electrons gives it 10 electrons.

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