1. Polyvalent Binary Ionic Compounds
Unit 6: Ch 7.1b & Ch 9.2b

2. Criss-Cross Method Determine the ions
Criss Cross the charges of the ions = chemical formula
Example: Calcium + Phosphorus

3. Criss-Cross Method Determine the ions
Criss Cross the charges of the ions = chemical formula
Example: Calcium + Phosphorus
Ca + P
IONS = Ca P3-

4. Criss-Cross Method Determine the ions
Criss Cross the charges of the ions = chemical formula
Example: Calcium + Phosphorus
Ca + P
IONS = Ca P3-
Ca3P2

5. Polyvalent Metals
Many but not all transition metals have “multiple personalities”
# of valence electrons varies
Polyvalent
they can form more than one ion
Roman Numerals are used to signify the charge

6. Transition Metals

7. Polyvalent Transition Metals
Metals with more than one possible charge:
Specific charge is indicated in parenthesis

8. Polyvalent Metals & Bonding
Fe(II) =
Iron (II) + oxygen =

9. Polyvalent Metals & Bonding
Fe(II) = Fe2+
Iron (II) + oxygen =

10. Polyvalent Metals & Bonding
Fe(II) = Fe2+
Iron (II) + oxygen =
Fe2+ & O2-

11. Polyvalent Metals & Bonding
Fe(II) = Fe2+
Iron (II) + oxygen =
Fe2+ & O2-  Fe2O2  FeO

12. Polyvalent Metals & Bonding
Fe(II) = Fe2+
Iron (II) + oxygen =
Fe2+ & O2-  Fe2O2  FeO
Fe(III) = Fe3+
Iron (III) + oxygen =

13. Polyvalent Metals & Bonding
Fe(II) = Fe2+
Iron (II) + oxygen =
Fe2+ & O2-  Fe2O2  FeO
Fe(III) = Fe3+
Iron (III) + oxygen =
Fe3+ & O2-

14. Polyvalent Metals & Bonding
Fe(II) = Fe2+
Iron (II) + oxygen =
Fe2+ & O2-  Fe2O2  FeO
Fe(III) = Fe3+
Iron (III) + oxygen =
Fe3+ & O2-  Fe2O3

15. Naming Polyvalent IOns
Stock Name:
Same as Simple Binary Ionic
Plus metal’s oxidation #/charge (roman numeral) in parentheses
Fe2+  Iron (II) ion
Fe3+  Iron (III) ion

16. Naming Polyvalent Ions
Classical Name:
Uses root word (typically from Latin name) with different suffixes for different oxidation #’s/charges
-ous  lower ionic charge
-ic  higher ionic charge
Example:
Iron  Ferrum
Fe2+  Ferrous ion
Fe3+  Ferric ion
Pg 255  List of classical names – Take down the roots of the listed metals!

17. Naming Polyvalent Binary Ionic Compounds
Same as Simple Binary Ionic Compounds
Combine the ion names
FeO
Stock Name: Iron (II) Oxide
Classical Name: Ferrous Oxide
Fe2O3
Stock Name: Iron (III) Oxide
Classical Name: Ferric Oxide

18. Practice - Polyvalent Compounds
Names to Formulas
Silver (III) Nitride
Silver (II) Nitride
Vanadium (III) Chloride
Vanadium (II) Chloride
Lead (IV) Oxide
Lead (II) Oxide

19. Practice - Polyvalent Compounds
Formula to Name
Have to determine the oxidation #/Charge of your metal.
Reverse the criss cross (doesn’t always work)
Fe2O3 

20. Practice - Polyvalent Compounds
Formula to Name
Have to determine the oxidation #/Charge of your metal.
Reverse the criss cross (doesn’t always work)
Fe2O3  Fe3+ and O2-

21. Practice - Polyvalent Compounds
Formula to Name
Have to determine the oxidation #/Charge of your metal.
Reverse the criss cross (doesn’t always work)
Fe2O3  Fe3+ and O2-
Check the anion’s charge against the periodic table

22. Practice - Polyvalent Compounds
Formula to Name
Have to determine the oxidation #/Charge of your metal.
Reverse the criss cross (doesn’t always work)
Fe2O3  Fe3+ and O2-
Check the anion’s charge against the periodic table
O2- is correct  So Fe is a 3+

23. Practice - Polyvalent Compounds
Formula to Name
Have to determine the oxidation #/Charge of your metal.
Reverse the criss cross (doesn’t always work)
Fe2O3  Fe3+ and O2-
Check the anion’s charge against the periodic table
O2- is correct  So Fe is a 3+
Name  Iron (III) oxide or Ferric Oxide

24. Practice - Polyvalent Compounds
Formula to Name
Have to determine the oxidation #/Charge of your metal.
Reverse the criss cross (doesn’t always work)
FeO 

25. Practice - Polyvalent Compounds
Formula to Name
Have to determine the oxidation #/Charge of your metal.
Reverse the criss cross (doesn’t always work)
FeO  Fe1+ and O1-

26. Practice - Polyvalent Compounds
Formula to Name
Have to determine the oxidation #/Charge of your metal.
Reverse the criss cross (doesn’t always work)
FeO  Fe1+ and O1-
Check the anion

27. Practice - Polyvalent Compounds
Formula to Name
Have to determine the oxidation #/Charge of your metal.
Reverse the criss cross (doesn’t always work)
FeO  Fe1+ and O1-
Check the anion
O1- is NOT correct  Been a reduction

28. Practice - Polyvalent Compounds
Formula to Name
Have to determine the oxidation #/Charge of your metal.
Reverse the criss cross (doesn’t always work)
FeO  Fe1+ and O1-
Check the anion
O1- is NOT correct  Been a reduction
1:1 ratio – metal started with the same charge as the anion.

29. Practice - Polyvalent Compounds
Formula to Name
Have to determine the oxidation #/Charge of your metal.
Reverse the criss cross (doesn’t always work)
SnO3 

30. Practice - Polyvalent Compounds
Formula to Name
Have to determine the oxidation #/Charge of your metal.
Reverse the criss cross (doesn’t always work)
SnO3  Sn3+ and O1-

31. Practice - Polyvalent Compounds
Formula to Name
Have to determine the oxidation #/Charge of your metal.
Reverse the criss cross (doesn’t always work)
SnO3  Sn3+ and O1-
O2-

32. Practice - Polyvalent Compounds
Formula to Name
Have to determine the oxidation #/Charge of your metal.
Reverse the criss cross (doesn’t always work)
SnO3  Sn3+ and O1-
O2-
x 2

33. Practice - Polyvalent Compounds
Formula to Name
Have to determine the oxidation #/Charge of your metal.
Reverse the criss cross (doesn’t always work)
SnO3  Sn3+ and O1-
Sn O2-
x 2

34. Practice - Polyvalent Compounds
Formula to Name
Have to determine the oxidation #/Charge of your metal.
Reverse the criss cross (doesn’t always work)
SnO3  Sn3+ and O1-
Sn O2-
Name: Tin (VI) Oxide
x 2