Ionic compounds continued Metals with Multiple Charges

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

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 Fe2+ - iron (II) chloride FeCl3  using Fe3+ - iron (III) chloride

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)

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 - 2 = 0 X = 2 Therefore the ionic charge of copper is +2

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

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