Here's why:

* Central atom: Carbon (C) is the central atom.

* Valence electrons: Carbon has 4 valence electrons, and each bromine (Br) atom has 7 valence electrons.

* Bonding: Carbon forms four single covalent bonds with four bromine atoms.

* Electron pairs: There are four bonding electron pairs around the central carbon atom.

* Shape: The four bonding pairs arrange themselves in a tetrahedral shape to minimize repulsion, resulting in bond angles of approximately 109.5 degrees.

Therefore, the molecular geometry of carbon tetrabromide is tetrahedral.