1. Determine the number of valence electrons:
* Bromine (Br): Bromine is in Group 17 (also known as Group VIIA), so it has 7 valence electrons.
* Iodine (I): Iodine is also in Group 17, so it also has 7 valence electrons.
2. Represent the atom with its symbol:
* Write the symbol for the element: "Br" for Bromine and "I" for Iodine.
3. Place dots around the symbol to represent the valence electrons:
* Start by placing one dot on each side of the symbol (top, bottom, left, right).
* Then, pair up the remaining dots on the same sides of the symbol.
Lewis Dot Structures:
Bromine (Br):
```
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:Br:
.
```
Iodine (I):
```
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:I:
.
```
Key Points:
* The dots represent the valence electrons, which are the electrons involved in chemical bonding.
* Each dot represents one electron.
* The maximum number of dots around an atom is eight, representing a full outer shell.
* Both bromine and iodine have seven valence electrons, and their Lewis structures show that they are one electron short of a full octet. This makes them highly reactive and likely to form bonds to gain an additional electron.
