1 Unit 5B Compounds and Their Bonds Naming and Writing Ionic Formulas

2 Charges of Representative Elements

Transition Metals 3

What is this rule? Correct Na + and Cl - = NaCl Mg 2+ and Cl - = MgCl 2 Al 3+ and Cl - = AlCl 3 Ca 2+ and P 3- = Ca 3 P 2 Wrong Na + and Cl - = Na 1 Cl 1 Mg 2+ and Cl - = Mg 2 Cl 1 Al 3+ and Cl - = Al 3 Cl 1 Ca 2+ and P 3- = Ca 2 P 3 4

Writing Ionic Formulas Use Swap & Drop to get subscripts 5 IonsFormulas cation anion Na + Cl - K + S 2- Mg 2+ O 2- Ca 2+ I - Al 3+ O 2-

What is this rule? Correct Ca 2+ and O 2- = CaO Sn 4+ and O 2- = SnO 2 Mg 2+ and S 2- = MgS Wrong Ca 2+ and O 2- = Ca 2 O 2 Sn 4+ and O 2- = Sn 2 O 4 Mg 2+ and S 2- = Mg 2 S 2 6

Writing Ionic Formulas Simplify the ratio of subscripts if possible. 7

Learning Check – Page 23 8

What is this rule? Correct Iron (III) & O 2- = Fe 2 O 3 Tin (II) & Cl - = SnCl 2 Copper (II) & F - = CuF 2 Wrong Iron (III) & O 2- = Fe 3 O 2 Tin (II) & Cl - = Sn 2 Cl Copper (II) & F - = Cu 2 F 9

Writing Ionic Formulas Transition metals can have more than 1 positive charge. We use Roman numerals to designate the charge. 10

11 Naming Ionic Compounds with Variable Charge Metals

12 Learning Check Write the names for compounds of the following ions: Br − S 2− N 3− Na + Al 3+

13 Naming Variable Charge Metals Transition metals with two different ions use a Roman numeral after the name of the metal to indicate ionic charge.

14 Learning Check Select the correct name for each. A. Fe 2 S 3 1) iron sulfide 2) iron(II) sulfide 3) iron(III) sulfide B. CuO 1) copper oxide 2) copper(I) oxide 3) copper(II) oxide

15 Solution Select the correct name for each. A. Fe 2 S 3 3) iron (III) sulfide Fe 3+ S 2- B. CuO 3) copper (II) oxide Cu 2+ O 2-