Where do Electrons escape from ?
TiCl4 , for the central Ti neutral counting : Ti contributes 4 electrons , each chlorine radical contributes one each : 4 +4 (1) = 8 valence electrons ionic counting : Ti4 + contributes 0 electrons , each chloride anion contributes two each : 0 +4 (2) = 8 valence electrons conclusion : Having only 8e ( vs. 18 possible ) , we can anticipate that TiCl4 will be a good Lewis acid .