Multivalent (aka Transition) Metals Formula to Name

Definition Multivalent Metal- metal that has more than one possibility for cationic charge The Appendix of your book (Page A-2) has the following chart Common multivalent metals and their charges Cobalt Co+2 Co+3 Copper Cu+1 Cu+2 Iron Fe+2 Fe+3 Lead Pb+2 Pb+4 Manganese Mn+2 Mn+3 Mercury Hg2+2 Hg+2 Tin Sn+2 Sn+4

Identifying & Naming Multivalent (Transition) Metals These compounds have: One of the multivalent (transition) metals in that chart To name these compounds: Write the name of the metal element (cation) Write the name of the anion (element name with “-ide” or polyatomic ion name) Determine the total negative charge Total negative charge = total positive charge for all neutral compounds Determine the charge on each metal atom Write the charge in roman numerals in parenthesis after the metal’s name

Example #8 CuCl

CuCl Example #8 Copper Chloride Cation Anion “Copper” “Chlorine” becomes “Chloride” Copper Chloride

CuCl Example #8 Copper Chloride (I) Cation Anion “Copper” Chloride has a –1 charge CuCl -1 charge * 1 ion = -1 A –1 charge needs a +1 charge Anion “Chlorine” becomes “Chloride” Therefore, copper must be +1 Copper Chloride (I)

Example #9 Fe2(CO3)3

Fe2(CO3)3 Example #9 Iron carbonate Cation Polyatomic Anion “Iron”

Fe2(CO3)3 Example #9 Iron carbonate (III) Cation Polyatomic Anion Carbonate has a –2 charge Fe2(CO3)3 -2 charge * 3 ions = -6 A –6 charge needs a +6 charge and there are 2 iron ions Polyatomic Anion “Carbonate” Therefore, iron must be +3 Iron carbonate (III)

Write the name for the following compounds Let’s Practice PbCl2 PbCl4 MnO Mn2O7 Example: Write the name for the following compounds

Write the name for the following compounds Let’s Practice PbCl2 PbCl4 MnO Mn2O3 Lead (II) chloride Lead (IV) chloride Manganese (II) oxide Manganese (VII) oxide Example: Write the name for the following compounds

Reminders from Section 2.2 Your Appendix (Page A-2) has lists of: Common polyatomic ions Multivalent metals Covalent prefixes Use your periodic table to determine the charges of common elements when they form ions

Multivalent Metals Name to Formula

Definition Multivalent Metal- metal that has more than one possibility for cationic charge

Identifying & Naming Multivalent Metals These compounds: Will have roman numerals To write these formulas: Same as binary ionic or polyatomic ionic. The roman numerals tell the charge of the metal (cation)

Example #5 Iron (III) oxide

Example #5 Fe+3 Cation Iron (III) oxide Anion O-2

Fe2O3 Example #5 Iron (III) oxide Cation Anion Fe+3 Fe+3O2- +3 + -2 = -1 Iron (III) oxide Fe+3Fe+3O2-O2- Anion +3 + 3 + -2 + -2 + -2 = 0 O-2 The subscript “2” and “3” are used to show the numbers of atoms needed. Fe2O3

Example #6 Copper (II) nitrate

Example #6 Cu+2 Cation Copper (II) nitrate Polyatomic Anion NO3-1

Cu(NO3)2 Example #6 Copper (II) nitrate Cation Polyatomic Anion Cu+2 +2 + -1 = 1 Copper (II) nitrate Cu+2NO3-NO3- Polyatomic Anion +2 + -1 + -1 = 0 NO3-1 Use parenthesis when adding subscripts to a polyatomic ion Cu(NO3)2

Write the following chemical formulas Let’s Practice Iron (II) nitrate Copper (I) chloride Lead (IV) hydroxide Tin (II) oxide Example: Write the following chemical formulas

Write the following chemical formulas Let’s Practice Iron (II) nitrate Copper (I) chloride Lead (IV) hydroxide Tin (II) oxide Fe(NO3)2 CuCl Pb(OH)4 SnO Example: Write the following chemical formulas