Final answer:
The correct chemical formula for the Lewis dot structure is CS2, which is a linear molecule with carbon doubly bonded to two sulfur atoms, fitting the description provided.
Step-by-step explanation:
The correct chemical formula for the Lewis dot structure that you are referring to is most likely CS2. This is because the information provided mentions that CS2 has only two regions of electron density (all bonds with no lone pairs) and the shape is linear. This matches the typical Lewis structure of carbon disulfide, where carbon is doubly bonded to two sulfur atoms.
It's worth noting that in the Lewis structure for CS2, each sulfur atom will have a double bond with the central carbon atom, using up all four of carbon's valence electrons to form a stable molecule with a linear geometry.