1. Identify the Charges:
* Aluminum (Al) has a +3 charge (Al³⁺)
* Sulfur (S) has a -2 charge (S²⁻)
2. Find the Least Common Multiple (LCM):
* The LCM of 3 and 2 is 6.
3. Determine the Subscripts:
* To get a +6 charge, you need two aluminum ions (2 x +3 = +6)
* To get a -6 charge, you need three sulfur ions (3 x -2 = -6)
4. Write the Formula:
The ionic formula is Al₂S₃
