1. Ionic compounds continued
Metals with Multiple Charges

2. Metals with Multiple Charges
Some transition metals have multiple charges.
For example iron has a stable cation when it has a charge of Fe2+ and Fe3+
Because of this there are two different compounds that can be formed with anions
FeCl2 is light green when solid
FeCl3 is yellowish brown when solid

3. Naming metals with multiple charges
When there are two different compounds that can be formed with anions we must indicate using roman numerals which anion we are using:
FeCl2  using Fe iron (II) chloride
FeCl3  using Fe iron (III) chloride

4. Metals with Multiple Charges
Chemical symbol
of elements
Chemical symbol of ions
Names of ions
Copper Cu
Cu +
Cu2+
Copper(I)
Copper (II)
Iron Fe
Fe2+
Fe3+
Iron (II)
Iron (III)
Lead Pb
Pb2+
Pb4+
Lead (II)
Lead (IV)
Manganese Mn
Mn2+
Mn4+
Manganese (II)
Manganese (IV)
tin Sn
Sn2+
Sn4+
Tin (II)
Tin (IV)

5. Considering multiple ionic charges
Write the chemical name of CuBr2
Problem, what cation of Cu is being used?
Step 1: Use x to represent the unknown value, knowing that when we add the charge of bromine and copper it must = a net of 0
CuBr2
X + 2(-1) = 0
X = 0
X = 2
Therefore the ionic charge of copper is +2

6. Considering multiple ionic charges
Step 2: Write the name of the compound, using roman numerals to represent the charge of copper
CuBr2  copper(II) bromide

7. Considering multiple ionic charges
Example 2: What is the chemical name of PbO2?