The compound AlCl3 contains how many atoms?
Three chlorine and one aluminum
The number of atoms of a compound can be determined by determining the subscripts used in each of the element involved. Then, adding these numbers. For this case, the subscript of aluminum (Al) is one which means there is only 1 aluminum atom. The subscript of chlorine (Cl) is 3 as there are 3 chlorine atoms. Therefore, the answer for this item is 4.