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the crisscross method is really useful when weamp;#39;re trying to write the formula for ionic compounds so take for example calcium chloride we know that calcium is ca and that chlorine the chloride ion thatamp;#39;s cl so we have cacl but because this is an ionic compound we have to take the charges into account so if we look at the periodic table this oneamp;#39;s set up to show us the charges we can see calcium right here is in group two so it has a 2 plus ionic charge the chlorine chloride ion that is right here in the halogens that has the 1 minus ionic charge so for this to be a valid formula these have to add up to zero have a net charge of zero so letamp;#39;s use the crisscross method we can take this two plus here and move it down here and we can take this one minus and move it over here we donamp;#39;t leave the charges in so letamp;#39;s get rid of those and we donamp;#39;t usually write one thatamp;#39;s assumed and thatamp;#39;s the formula for calcium chloride