Here's why:

* Electronegativity: Chlorine is more electronegative than sulfur. This means chlorine has a stronger pull on shared electrons in a bond.

* Sharing electrons: While the difference in electronegativity is significant, it's not large enough to create an ionic bond where one atom completely loses an electron and the other gains it. Instead, the atoms share electrons to achieve a more stable configuration.

* Polar Covalent Bond: Due to the electronegativity difference, the shared electrons will spend more time closer to the chlorine atom. This creates a polar covalent bond, where the chlorine side of the molecule has a partial negative charge and the sulfur side has a partial positive charge.

Therefore, sulfur and chlorine will form a polar covalent bond to create molecules like sulfur dichloride (SCl2).