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Teacher Notes Name Key Class Date Ionic Compounds I Background For #1-12, instruct students to simply name the ions in the compound, using the –ide suffix on the nonmetal. Remind them that ionic compounds do not use the Greek prefixes. For #13-24, suggest that students write the formula with charge on top of the ion’s name. A simple way to write the formula is the “criss-cross” method. Mg+2 Cl-1 magnesium chloride The formula is MgCl2. (One subscripts are understood.) The final step in this method is to make sure the subscripts are expressed in their lowest ratio. Zr+4 zirconium O-2 oxide The criss-cross method results in Zr2O4, but lowest ratio is ZrO2. In order for the number of electrons lost by zirconium to equal the number of electrons gained by the oxygen, only one zirconium and two oxygens are needed. Students should know how to predict the charge on ions by periodic table group. Key (Monatomic Ions) 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. sodium chloride aluminum fluoride potassium oxide silver chloride barium iodide rubidium sulfide strontium fluoride potassium bromide zirconium oxide yttrium fluoride lithium nitride sodium sulfide 25. potassium nitride, K3N 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. MgCl2 Li2O CaBr2 ZnS Na3N Al2O3 CaS CsI MgO K2S RbF BeO