* Bromine (Br) is a halogen and typically has an oxidation number of -1.
* The overall charge of the molecule is 0 because it is a neutral molecule.
Since we have four bromine atoms, their total oxidation number is -4. To balance this out and have a net charge of 0, the carbon atom must have an oxidation number of +4.
Therefore, the oxidation number of carbon (C) in CBr4 is +4.
