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CHEM 111
Beatrice Botch

Chem 111/121 9/10/02 Nomenclature Worksheet 3: Naming of Transition metal salts Like all metals, when transition metals combine with a nonmetal they form ionic compounds. They differ from the Group A elements in that they can form cations with different charges. For example iron can form both Fe and Fe ions. Because of this the charge (or oxidation state) of the metal in the compound is usually included in the name. This is done by writing the oxidation state as a roman numeral in parentheses directly following the name of the element. Sometimes older nomenclature is used where the lower oxidation state is given an “ous” ending, the higher is given an “ic” ending. For Chem 111 you should use the roman numeral (IUPAC) method. IUPAC Name Older name Fe 2+ iron(II) ion Ferrous ion 3+ Fe iron(III) ion Ferric ion The charge for certain elements is so common that it is often not stated. Here are some exceptions: Accepted Name IUPAC Name Ni 2+ nickel ion nickel(II) ion 2+ Cu + copper ion copper(II) ion Ag silver ion silver(I) ion Zn 2+ zinc ion never written as zinc(II) In addition to the transition metals, the Group 4A metals tin and lead can have2+2 or +4 oxidation states. These are specified in the same manner: lead(IV), tin(II) and tin(IV). Pb is just called lead ion. Name of compound
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