Ionic compounds are made up of cations and anions. The formula for an ionic compound is written is a way that the number of positive charges should equal the number of negative charges.
To write the formula for the compound composed of scandium and iodine. We need the charge that iodine acquired when it reacts with a metal.
Iodine is a halogen and it belongs to group 7A. It reacts with metals to gain 1 electron to form I- anion.
The most common charge associated with scandium in its compounds is 3+. Indicate the chemical formula you would expect for compounds formed between scandium and iodine.
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