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