Answer: the number of unshared pairs of electrons on the central carbon is 0.
Step-by-step explanation:
In the Lewis structure for the CS2 molecule (carbon disulfide), the central carbon (C) atom forms two double bonds with the sulfur (S) atoms.
In this structure, the central carbon (C) atom has formed two double bonds with the sulfur (S) atoms, and there are no unshared pairs of electrons on the central carbon. All valence electrons of the carbon atom are involved in forming the double bonds, and no lone pairs remain on the central carbon atom.
So, in the CS2 molecule, the number of unshared pairs of electrons on the central carbon is 0.