More Ionic More Ionic CompoundsCompounds

Rules for Writing Ionic Rules for Writing Ionic FormulasFormulas

The The cationcation comes first in the chemical comes first in the chemical formula for ionic compounds.formula for ionic compounds.

The The anionanion is written second in the is written second in the chemical formula for ionic compounds.chemical formula for ionic compounds.

Write the Write the symbolsymbol and the and the chargecharge of the of the cation next to the cation next to the symbolsymbol and and chargecharge of the anion.of the anion.

DropDrop the charges down and the charges down and swapswap them with the other symbol.them with the other symbol.

For ExampleFor Example

Mg Mg 2+2+ Cl Cl-1-1 MgClMgCl22

Let’s Practice Together:Let’s Practice Together:1. Ca 1. Ca 2+2+ Cl Cl-1-1 CaClCaCl22

2. Al 2. Al 3+3+ NO NO33--

11

Al(NOAl(NO33))33

Let’s Practice TogetherLet’s Practice Together

3. Fe 3. Fe 3+3+ ClCl – – = = 4. Na 4. Na ++ OH OH –– = = 5. Na 5. Na ++ S S 2-2- = =

3. Fe 3. Fe 3+3+ ClCl – – = FeCl = FeCl33

4. Na 4. Na ++ OH OH –– = NaOH = NaOH 5. Na 5. Na ++ S S 2-2- = Na = Na22S S

Rules for Naming Ionic Rules for Naming Ionic CompoundsCompounds

Name the Name the cationcation first. It is the first. It is the same as the element name of the same as the element name of the metalmetal..

Name the Name the anionanion second, but change second, but change the ending of the anion to the ending of the anion to ––ideide. For . For polyatomic ions, you write the polyatomic ions, you write the name of the polyatomic ion.name of the polyatomic ion.

PracticePractice

– KBr = Potassium BromideKBr = Potassium Bromide

– MgClMgCl22 = Magnesium Chloride = Magnesium Chloride

– LiLi33N =N =

– AlAl22OO33 = =

– NaOH = NaOH =

– NaNa22COCO33 = =

– KBr = Potassium BromideKBr = Potassium Bromide

– MgClMgCl22 = Magnesium Chloride = Magnesium Chloride

– LiLi33N = Lithium NitrideN = Lithium Nitride

– AlAl22OO33 = Aluminum Oxide = Aluminum Oxide

– NaOH = Sodium HydroxideNaOH = Sodium Hydroxide

– NaNa22COCO33 = Sodium Carbonate = Sodium Carbonate

Names Including Transition Names Including Transition Elements:Elements:

First write the name of the First write the name of the cationcation element.element.

Include the Include the roman numeralroman numeral indicating the charge of the metal indicating the charge of the metal behind the name of the cation.behind the name of the cation.

Then write the anion as instructed Then write the anion as instructed above.above.

Examples:Examples:

Pb(NOPb(NO33))22 = Lead (II) Nitrate = Lead (II) Nitrate

CuClCuCl22 = Copper (II) Chloride = Copper (II) Chloride

Fe(OH)Fe(OH)22 = =

FeClFeCl33 = =

Pb(NOPb(NO33))22 = Lead (II) Nitrate = Lead (II) Nitrate

CuClCuCl22 = Copper (II) Chloride = Copper (II) Chloride

Fe(OH)Fe(OH)22 = Iron (II) Hydroxide = Iron (II) Hydroxide

FeClFeCl33 = Iron (III) Chloride = Iron (III) Chloride

Names and FormulasNames and Formulas

14. chlorite14. chlorite

15. perchlorate15. perchlorate

16. hypochlorite16. hypochlorite

17. chloride17. chloride

18. chlorate18. chlorate

Names and FormulasNames and Formulas

19. Sodium Iodide19. Sodium Iodide

20. Calcium Chloride20. Calcium Chloride

21. Potassium Sulfide21. Potassium Sulfide

22. Magnesium Oxide22. Magnesium Oxide

23. Lithium Sulfate23. Lithium Sulfate

24. Ammonium Bromide24. Ammonium Bromide

25. Calcium Nitride25. Calcium Nitride

Names and FormulasNames and Formulas

26. Cessium Phosphide26. Cessium Phosphide

27. Potassium Bromate27. Potassium Bromate

28. Magnesium Hypochlorite28. Magnesium Hypochlorite

29. Lithium Oxide29. Lithium Oxide

30. Beryllium Phosphate 30. Beryllium Phosphate

31. Ammonium Carbonate31. Ammonium Carbonate

Names and FormulasNames and Formulas

32. Sodium Bromate32. Sodium Bromate

33. Iron (III) Oxide33. Iron (III) Oxide

34. Iron (II) Iodate34. Iron (II) Iodate

Names and FormulasNames and Formulas

35. Be35. Be33NN22

36. KClO36. KClO33

37. Cu37. Cu22OO

38. MgSO38. MgSO33

39. (NH39. (NH44))22SS

40. Ca(IO40. Ca(IO33))22