1. Naming Multivalent Compounds

2. What are multivalent ions?
Some transition metals can form more than one ion
In other words some have more than 1 ion form
For Example: Copper has 2 ion forms Can be a 1+ or 2+ ion
Copper I Chloride
Copper II Chloride

3. Writing Multivalent Compounds
Use roman numeral to show which ion form is present
Metal Ion charge Roman Numeral
1+ I
2+ II
3+ III
4+ IV
5+ V
6+ VI
7+ VII
Ni2+ or Nickel II, is called Nickel two
Fe3+ or Ion III, is called Iron three

4. Steps for writing formulas for multivalent compounds
Step 1: Identify each ion and its charge
Step 2: Determine the total charges needed to balance positive and negative
Step 3: Note the ratio of positive ions to negative ions
Step 4: Use subscripts to write the formula, 1’s are not shown in subscript

5. Example: Copper II Chloride
Cu2+ and Cl-
ions
Total charge to balance
+2 = -1-1
ratio
1 : 2
formula
CuCl2

6. Example: Manganese IV Oxide
Mn4+ and O-2
ions
Total charge to balance
+4 = -2-2
ratio
1 : 2
formula
MnO2

7. Steps for naming compounds that contain a multivalent metal
Step 1: Identify the multivalent metal (first ion written in formula
Step 2: verify that it has more than one ion form
Step 3: determine the ratio of ions in the formula
Step 4: what is the charge on the negative ion?
Step 5: what must be the charge on the positive metal ion if it is to balance the negative ion
Step 6: write the name of the compound

8. Example: Au3N Au ID the metal Au+ and Au3+
Can it be in more than 1 ion form?
Au3N 3 Au ions for every 1 N ion
Determine the ratio of ions in the formula
Charge on the negative ion
N3-
If there are 3 Au ions then the
charge on Au must be 1+ to
balance out N3-
What does the charge on the metal
have to be to balance the negative ion?
The Name is: Gold(I)Nitride