Worksheet: Writing Chemical Formulas for Binary Ionic Compounds

Instructions

For each of the following pairs of elements or ions, write the correct chemical formula for the binary ionic compound that they would form. Remember that the overall charge of the compound must be neutral.

1.  Sodium and Chlorine

2.  Potassium and Iodine

3.  Magnesium and Bromine

4.  Calcium and Oxygen

5.  Barium and Sulfur

6.  Aluminum and Fluorine

7.  Lithium and Nitrogen

8.  Aluminum and Oxygen

9.  Gallium and Phosphorus

10. Strontium and Chlorine

11. Cesium and Sulfur

12. Beryllium and Nitrogen

13. Iron (II) and Oxygen

14. Iron (III) and Chlorine

15. Copper (I) and Bromine

16. Copper (II) and Sulfur

17. Lead (IV) and Oxygen

18. Tin (II) and Fluorine

19. Zinc and Iodine

20. Silver and Phosphorus

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Answer Key

1.  NaCl

2.  KI

3.  MgBr₂

4.  CaO

5.  BaS

6.  AlF₃

7.  Li₃N

8.  Al₂O₃

9.  GaP

10. SrCl₂

11. Cs₂S

12. Be₃N₂

13. FeO

14. FeCl₃

15. CuBr

16. CuS

17. PbO₂

18. SnF₂

19. ZnI₂

20. Ag₃P