1. Determine the number of valence electrons:
* Bromine (Br) is in group 17 (VIIA) of the periodic table, so it has 7 valence electrons.
* The negative charge indicates an extra electron.
* Total valence electrons: 7 + 1 = 8
2. Represent the bromine atom:
* Draw the symbol "Br".
3. Place the valence electrons around the atom:
* Start by placing one dot on each side of the bromine symbol (top, bottom, left, right).
* Then, add the remaining dots, pairing them up on the sides you already have a dot on.
Here's the final Lewis dot diagram for Br⁻:
```
..
:Br:
..
```
Key points:
* The dots represent the valence electrons.
* The negative charge is indicated by adding an extra electron to the atom.
* The Lewis dot diagram should show all 8 valence electrons in the bromide ion (Br⁻).
