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Give the formulas for the ionic compounds made of the following ions:

Sc3+ and Br¯

K+ and O2¯

Ca2+ and I¯

Cr3+ and S2¯

Rb+ and F¯

magnesium (Mg) and oxygen (O) ions

potassium (K) and nitrogen (N) ions

strontium (Sr) and fluorine (F) ions

aluminum (Al) and sulfur (S) ions

Verified Answer :

ScBr3, K2O, CaI2, Cr2S3, RbF, MgO, K3N, SrF2, and Al2S3. The only thing you need to do is to ensure every ionic compound has a total valence of zero. Four the last four, you need to know usually valence of these ions.