1. Multivalent (aka Transition) Metals Formula to Name

2. Definition
Multivalent Metal- metal that has more than one possibility for cationic charge
The Appendix of your book (Page A-2) has the following chart
Common multivalent metals and their charges
Cobalt Co Co+3
Copper Cu Cu+2
Iron Fe Fe+3
Lead Pb Pb+4
Manganese Mn+2 Mn+3
Mercury Hg2+2 Hg+2
Tin Sn Sn+4

3. Identifying & Naming Multivalent (Transition) Metals
These compounds have:
One of the multivalent (transition) metals in that chart
To name these compounds:
Write the name of the metal element (cation)
Write the name of the anion (element name with “-ide” or polyatomic ion name)
Determine the total negative charge
Total negative charge = total positive charge for all neutral compounds
Determine the charge on each metal atom
Write the charge in roman numerals in parenthesis after the metal’s name

4. Example #8
CuCl

5. CuCl Example #8 Copper Chloride Cation Anion “Copper”
“Chlorine” becomes “Chloride”
Copper Chloride

6. CuCl Example #8 Copper Chloride (I) Cation Anion “Copper”
Chloride has a –1 charge
CuCl
-1 charge * 1 ion = -1
A –1 charge needs a +1 charge
Anion
“Chlorine” becomes “Chloride”
Therefore, copper must be +1
Copper Chloride
(I)

7. Example #9
Fe2(CO3)3

8. Fe2(CO3)3 Example #9 Iron carbonate Cation Polyatomic Anion “Iron”

9. Fe2(CO3)3 Example #9 Iron carbonate (III) Cation Polyatomic Anion
Carbonate has a –2 charge
Fe2(CO3)3
-2 charge * 3 ions = -6
A –6 charge needs a +6 charge and there are 2 iron ions
Polyatomic
Anion
“Carbonate”
Therefore, iron must be +3
Iron carbonate
(III)

10. Write the name for the following compounds
Let’s Practice
PbCl2
PbCl4
MnO
Mn2O7
Example:
Write the name for the following compounds

11. Write the name for the following compounds
Let’s Practice
PbCl2
PbCl4
MnO
Mn2O3
Lead (II) chloride
Lead (IV) chloride
Manganese (II) oxide
Manganese (VII) oxide
Example:
Write the name for the following compounds

12. Reminders from Section 2.2
Your Appendix (Page A-2) has lists of:
Common polyatomic ions
Multivalent metals
Covalent prefixes
Use your periodic table to determine the charges of common elements when they form ions

13. Multivalent Metals Name to Formula

14. Definition
Multivalent Metal- metal that has more than one possibility for cationic charge

15. Identifying & Naming Multivalent Metals
These compounds:
Will have roman numerals
To write these formulas:
Same as binary ionic or polyatomic ionic.
The roman numerals tell the charge of the metal (cation)

16. Example #5
Iron (III) oxide

17. Example #5
Fe+3
Cation
Iron (III) oxide
Anion
O-2

18. Fe2O3 Example #5 Iron (III) oxide Cation Anion Fe+3 Fe+3O2-
= -1
Iron (III) oxide
Fe+3Fe+3O2-O2-
Anion
= 0
O-2
The subscript “2” and “3” are used to show the numbers of atoms needed.
Fe2O3

19. Example #6
Copper (II) nitrate

20. Example #6
Cu+2
Cation
Copper (II) nitrate
Polyatomic
Anion
NO3-1

21. Cu(NO3)2 Example #6 Copper (II) nitrate Cation Polyatomic Anion Cu+2
= 1
Copper (II) nitrate
Cu+2NO3-NO3-
Polyatomic
Anion
= 0
NO3-1
Use parenthesis when adding subscripts to a polyatomic ion
Cu(NO3)2

22. Write the following chemical formulas
Let’s Practice
Iron (II) nitrate
Copper (I) chloride
Lead (IV) hydroxide
Tin (II) oxide
Example:
Write the following chemical formulas

23. Write the following chemical formulas
Let’s Practice
Iron (II) nitrate
Copper (I) chloride
Lead (IV) hydroxide
Tin (II) oxide
Fe(NO3)2
CuCl
Pb(OH)4
SnO
Example:
Write the following chemical formulas