The valence of aluminum is +3, and the valence of chlorine is –1. the formula for aluminum chloride is
correctly written as
a. clal3.
b. cl3al.
c. alcl3.
d. al3cl.

The correct option is C.i.e. AlCl3 Given: The valence of aluminum is +3, and the valence of chlorine is –1. Thus, 3 chlorine atoms each of (-1 charge )combine to make the charge balance because of Al (3+). Thus, 1 atom of Aluminum (Al) binds with three atoms of Chlorine (Cl).Thus, the net foromula becomes AlCl3