To determine the polarity of SCl2, we need to consider the electronegativity difference between sulfur and chlorine atoms. Electronegativity is the ability of an atom to attract electrons towards itself. In SCl2, sulfur is the central atom and chlorine atoms are attached to it.

The electronegativity of sulfur is 2.58, while the electronegativity of chlorine is 3.0. This means that chlorine atoms have a higher electronegativity than sulfur. As a result, the electrons in the S-Cl bonds are pulled more towards the chlorine atoms, creating a partial negative charge on the chlorine atoms and a partial positive charge on the sulfur atom.

The difference in electronegativity between sulfur and chlorine is 0.42 (3.0 - 2.58). This value is significant enough to create a polar bond. However, since the molecule has a linear shape, the two polar S-Cl bonds cancel each other out, resulting in a nonpolar molecule.

Therefore, SCl2 is a nonpolar molecule.