Write Lewis dot symbols for the following atoms and ions :
(i) O (ii) `O^(2-)` (iii) `Mg^(2+)` (iv) `P^(3-)` (v) `Br`

Explanation

To write the Lewis dot symbols for the given atoms and ions, we need to determine the number of valence electrons for each and represent them accordingly. Here’s a step-by-step solution:

### Step 1: Oxygen (O)
- **Valence Electrons**: Oxygen is in Group 16, which means it has 6 valence electrons.
- **Lewis Dot Symbol**: We represent the 6 valence electrons as dots around the symbol for oxygen (O).

**Lewis Dot Symbol**:
```
...