The Lewis structure of the molecule PCl3 Phosphorus trichloride can be drawn as follows:1. Determine the total number of valence electrons in the molecule. Phosphorus P has 5 valence electrons, and each chlorine Cl atom has 7 valence electrons. Since there are three chlorine atoms, the total number of valence electrons is 5 + 3 7 = 26.2. Place the least electronegative atom P in the center and surround it with the more electronegative atoms Cl . Cl | P / \ Cl Cl3. Connect the central atom P to each surrounding atom Cl with a single bond. This uses 2 electrons for each bond, so 6 electrons are used in total.4. Distribute the remaining 20 electrons 26 total - 6 used as lone pairs around the chlorine atoms to satisfy the octet rule. Each chlorine atom will have 3 lone pairs 6 electrons around it.The final Lewis structure for PCl3 is: Cl : | : P : Cl----|----Cl : :Each chlorine atom has 3 lone pairs and is single-bonded to the central phosphorus atom, which has one lone pair.