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Calcium and chorine form CaCl2. This would require 2 Cl- ions.
Aluminum with chlorine forms AlCl3. This would require 3 Cl- ions.
Silver with Chlorine forms AgCl. This would require 1 Cl- ion.
Generally to find the number of chloride ions Cl- ions required, we need to look at the charge on the other ion with which the chloride ion is combining. As the chloride ion has one negative charge, the number of chloride ions required will be equal to the number of positive charges on the ion it is combining with.
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