More Ionic Compounds
Rules for Writing Ionic
Formulas



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The cation comes first in the chemical
formula for ionic compounds.
The anion is written second in the
chemical formula for ionic compounds.
Write the symbol and the charge of the
cation next to the symbol and charge of
the anion.
Drop the charges down and swap them
with the other symbol.
For Example
Mg
2+
Cl-1
MgCl2
Let’s Practice Together:
1. Ca
2. Al
2+
3+
Cl-1
NO3-1
CaCl2
Al(NO3)3
Let’s Practice Together
3. Fe 3+
Cl – = FeCl3
 4. Na + OH – = NaOH
 5. Na + S 2- = Na2S
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Rules for Naming Ionic
Compounds
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
Name the cation first. It is the same as
the element name of the metal.
Name the anion second, but change the
ending of the anion to –ide. For
polyatomic ions, you write the name of
the polyatomic ion.
Practice
–
–
–
–
–
–
KBr = Potassium Bromide
MgCl2 = Magnesium Chloride
Li3N = Lithium Nitride
Al2O3 = Aluminum Oxide
NaOH = Sodium Hydroxide
Na2CO3 = Sodium Carbonate
Names Including Transition
Elements:
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First write the name of the cation
element.
Include the roman numeral indicating
the charge of the metal behind the name
of the cation.
Then write the anion as instructed
above.
Examples:
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Pb(NO3)2 = Lead (II) Nitrate
CuCl2 = Copper (II) Chloride
Fe(OH)2 = Iron (II) Hydroxide
FeCl3 = Iron (III) Chloride
Names and Formulas
14. chlorite
15. perchlorate
16. hypochlorite
17. chloride
18. chlorate
Names and Formulas
19.
20.
21.
22.
23.
24.
25.
Sodium Iodide
Calcium Chloride
Potassium Sulfide
Magnesium Oxide
Lithium Sulfate
Ammonium Bromide
Calcium Nitride
Names and Formulas
26. Cessium Phosphide
27. Potassium Bromate
28. Magnesium Hypochlorite
29. Lithium Oxide
30. Beryllium Phosphate
31. Ammonium Carbonate
Names and Formulas
32. Sodium Bromate
33. Iron (III) Oxide
34. Iron (II) Iodate
Names and Formulas
35. Be3N2
36. KClO3
37. Cu2O
38. MgSO3
39. (NH4)2S
40. Ca(IO3)2