Naming Covalent Compounds : A binary covalent compound is composed of two different nonmetal elements. For example, a molecule of chlorine trifluoride, ClF3 contains 1 atom of chlorine and 3 atoms of fluorine. Transition Metal Cations and Lead and Mercury Transition metal cations, and cations of lead and mercury, can have more than one oxidation state. In this case, the oxidation state is specified as a roman numeral in parentheses. For example: Fe 3+ is named iron(III) ...... Fe 2+ is named iron(II) Hg 2+ is named mercury(II) Pb 4+ is named lead(IV) Sometimes the oxidation state is really common and the parentheses are often omitted. This happens with the common oxidation states of silver, nickel, copper, and lead: Ion Common Name IUPAC Name Ag + ...silver silver(I) Ni 2+ ...nickel nickel(II) Cu 2+ ...copper copper(II) Pb 2+ ...lead lead(II) Zn 2+ ...zinc zinc, always +2 Nomenclature of Binary Ionic Compounds Binary compounds are composed of two elements. When one of these elements is a
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