2. Objectives Determine the name of ionic compounds from their formula Determine the name of ionic compounds from their formula Determine the correct formula of ionic compounds from their name Determine the correct formula of ionic compounds from their name

3. Nomenclature Means giving names to things Means giving names to things Every compound has a unique name that distinguishes from other compounds Every compound has a unique name that distinguishes from other compounds Example: BF 3 & BaF 2 Example: BF 3 & BaF 2  Boron trifluoride & Barium fluoride

4. Rules for Naming Ionic Compounds 1.Find the name of the first element (cation) from your periodic table or ion sheet 2.Find the name of the second element or polyatomic ion from your ion sheet  The second element (anion) always changes its name

5. Naming Ionic Compounds

7. Practice 1.MgBr 2 2.Rb 2 O 3.Li 3 N 4.K 2 SO 4 5.Na 2 CO 3

8. Transition Metals Some cations must show their charge Some cations must show their charge How would we name FeO & Fe 2 O 3 ? How would we name FeO & Fe 2 O 3 ?  Iron oxide Transition metals can form more than one type of cation Transition metals can form more than one type of cation We must use Roman numerals to distinguish them We must use Roman numerals to distinguish them  Example: Iron (II) oxide & Iron (III) oxide

10. Practice 1.Cr(OH) 3 2.CuSO 4 3.Pb 3 (PO 4 ) 2 4.FeCl 3 5.AgNO 3

11. Writing Formulas for Ionic Compounds Step 1: Write down the symbols that match the ions Step 1: Write down the symbols that match the ions Step 2: Determine the charge of each one Step 2: Determine the charge of each one Step 3: Find the least common multiple of the ions’ charges. Step 3: Find the least common multiple of the ions’ charges. Step 4: Write the chemical formula, indicating with subscripts how many of each ion are needed to make a neutral compound. Step 4: Write the chemical formula, indicating with subscripts how many of each ion are needed to make a neutral compound. *use parentheses when you have more than one polyatomic ion *use parentheses when you have more than one polyatomic ion

12. Practice 1.Lithium oxide 2.Potassium chloride 3.Titanium (III) nitride 4.Cobalt (III) hydroxide 5.Copper (I) sulfate 6.Aluminum phosphate