Transition Metals Wtg. Formulas / Nmg. Compounds Most transition metals can form ions with more than one oxidation number. Examples: Copper atoms can become Cu +1 and Cu +2 ions Iron atoms can become Fe +2 and Fe +3 ions

Writing Formulas w/Transition Metals Iron (III) Oxide Write the symbol for the transition metal. Ex.Fe Take the oxidation number of the metal, written in parentheses, and write it as the oxidation number. Ex. Fe +3

Writing Formulas w/Transition Metals Iron (III) Oxide Write the symbol for the nonmetal. Ex. O Look up its oxidation number on the periodic table, and add it to the symbol. Ex.O -2

Writing Formulas w/Transition Metals Fe +3 O –2 Find the common factor between the two oxidation numbers. In this case = 6 Decide how many of each ion is needed to make the charge equal to the common factor. In this case 2 Fe and 3 O ions. Use this number of ions as the subscript for the element, and write the formula. Fe 2 O 3

Copper (I) Sulfide Write the symbol for the transition metal. Ex.Cu Take the oxidation number of the metal, written in parentheses, and write it as the oxidation number. Ex.Cu +1

Copper (I) Sulfide Write the symbol for the nonmetal. Ex. S Look up its oxidation number on the periodic table, and add it to the symbol. Ex.S -2

Copper (I) Sulfide Cu +1 S –2 Find the common factor between the two oxidation numbers. In this case = 2 Decide how many of each ion is needed to make the charge equal to the common factor. In this case 2 Cu and 1 S ion. Use this number of ions as the subscript for the element, and write the formula. Cu 2 S

Naming Compounds w/Transition Metals FeO Look up the nonmetal on the periodic table. Find its oxidation number. Oxygen O -2 Look up the metal on your ion chart. Find the possible oxidation numbers. Fe +2 or Fe +3

Fe +2 or Fe +3 O -2 Decide which ion will form in the proper ratio with the known charge on the oxygen ion. FeO Iron bonds in a 1 to 1 ratio with oxygen, therefore, the iron ion must have a +2 charge. Name the compound, indicating the oxidation number of the metal in parenthesis. Iron (II) Oxide

Fe 2 O 3 Look up the nonmetal on the periodic table. Find its oxidation number. Oxygen O -2 Look up the metal on your ion chart. Find the possible oxidation numbers. Fe +2 or Fe +3

Fe 2 O 3 Decide which ion will form in the proper ratio with the known charge on the oxygen ion. Fe +2 or Fe +3 Iron bonds in a 2 to 3 ratio with oxygen. Three oxygen atoms will have a charge of -6. Therefore, two iron ions must equal +6. It must be Fe +3. Name the compound, indicating the oxidation number of the metal in parenthesis. Iron (III) Oxide