Final answer:
The formula for indium chloride based on indium's position in the periodic table is InCl3, because indium (In) forms a +3 cation and combines with three chlorine anions to form a neutral compound.
Step-by-step explanation:
The student's question relates to the properties and the chemical composition of indium chloride based on indium's position in the periodic table. Indium is located in Group 13 and is a post-transition metal. Combining indium with chlorine, a halogen found in Group 17 that forms -1 anions (Cl-), leads to the formation of indium chloride. Since indium typically forms a +3 cation (In3+), the formula for indium chloride is InCl3, where one indium atom combines with three chlorine atoms to form a neutral compound.