# Naming Multivalent Compounds. What are multivalent ions? Some transition metals can form more than one ion In other words some have more than 1 ion form.

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Naming Multivalent Compounds

What are multivalent ions? Some transition metals can form more than one ion In other words some have more than 1 ion form For Example: Copper has 2 ion forms Can be a 1+ or 2+ ion Copper I Chloride Copper II Chloride

Writing Multivalent Compounds Use roman numeral to show which ion form is present Metal Ion chargeRoman Numeral 1+I 2+II 3+III 4+IV 5+V 6+VI 7+VII Ni 2+ or Nickel II, is called Nickel two Fe 3+ or Ion III, is called Iron three

Steps for writing formulas for multivalent compounds Step 1: Identify each ion and its charge Step 2: Determine the total charges needed to balance positive and negative Step 3: Note the ratio of positive ions to negative ions Step 4: Use subscripts to write the formula, 1’s are not shown in subscript

Example: Copper II Chloride Cu 2+ and Cl - +2 = -1-1 ions Total charge to balance ratio1 : 2 formula CuCl 2

Example: Manganese IV Oxide Mn 4+ and O -2 +4 = -2-2 ions Total charge to balance ratio1 : 2 formula MnO 2

Steps for naming compounds that contain a multivalent metal Step 1: Identify the multivalent metal (first ion written in formula Step 2: verify that it has more than one ion form Step 3: determine the ratio of ions in the formula Step 4: what is the charge on the negative ion? Step 5: what must be the charge on the positive metal ion if it is to balance the negative ion Step 6: write the name of the compound

Example: Au 3 N ID the metal Au Can it be in more than 1 ion form? Au + and Au 3+ Determine the ratio of ions in the formula Au 3 N 3 Au ions for every 1 N ion Charge on the negative ion N 3- What does the charge on the metal have to be to balance the negative ion? If there are 3 Au ions then the charge on Au must be 1+ to balance out N 3- The Name is: Gold(I)Nitride

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