General, Organic, and Biological Chemistry Fourth Edition Karen Timberlake 5.3 Naming and Writing Ionic Formulas Chapter 5 Compounds and Their Bonds © 2013 Pearson Education, Inc. Lectures

© 2013 Pearson Education, Inc. Chapter 5, Section 3 2 Naming and Writing an Ionic Formula The name of an ionic compound  is made up of 2 elements.  has the name of the metal ion written first.  has the name of the nonmetal ion written second using the first syllable of its element name. followed by ide.  has a space separating the name of the metal and nonmetal.

© 2013 Pearson Education, Inc. Chapter 5, Section 3 3 Charges of Representative Elements

© 2013 Pearson Education, Inc. Chapter 5, Section 3 4 Names of Some Common Ions

© 2013 Pearson Education, Inc. Chapter 5, Section 3 5 Naming Ionic Compounds with Two Elements

© 2013 Pearson Education, Inc. Chapter 5, Section 3 6 Step 1 Identify the cation and anion. The cation from Group 2A (2) is Mg 2+, and the anion from Group 5A (15) is N 3−. Step 2 Name the cation by its element name. Cation: Mg 2+ is magnesium Step 3 Name the anion by using the first syllable of its element name followed by ide. Anion: nitrogen becomes nitride, N 3− Step 4 Write the name for the cation first and the name for the anion second. Mg 3 N 2 is magnesium nitride. Naming Mg 3 N 2

© 2013 Pearson Education, Inc. Chapter 5, Section 3 7 Names of Some Ionic Compounds

© 2013 Pearson Education, Inc. Chapter 5, Section 3 8 Write the names of the following compounds. 1. CaO___________ 2. KBr___________ 3. Al 2 O 3 ___________ 4. MgCl 2 ___________ Learning Check

© 2013 Pearson Education, Inc. Chapter 5, Section 3 9 Write the names of the following compounds. 1. CaOcalcium oxide 2. KBrpotassium bromide 3. Al 2 O 3 aluminum oxide 4. MgCl 2 magnesium chloride Solution

© 2013 Pearson Education, Inc. Chapter 5, Section 3 10 Learning Check Write the formulas and names for compounds of the following ions Br – S 2− N 3− Na + Al 3+

© 2013 Pearson Education, Inc. Chapter 5, Section 3 11 Solution Br − S 2− N 3− Na + Al 3+ NaBr sodium bromide Na 2 S sodium sulfide Na 3 N sodium nitride AlBr 3 aluminum bromide Al 2 S 3 aluminum sulfide AlN aluminum nitride

© 2013 Pearson Education, Inc. Chapter 5, Section 3 12 Metals with Variable Charge Most transition metals (3-12) and Group 4A (14) metals form 2 or more positive ions, except Zn 2+, Ag +, and Cd 2+, which form only one ion.

© 2013 Pearson Education, Inc. Chapter 5, Section 3 13 Metals with Variable Charge The names of transition metals with two or more positive ions (cations) use a Roman numeral after the name of the metal to identify the ion charge.

© 2013 Pearson Education, Inc. Chapter 5, Section 3 14 Naming Ionic Compounds with Variable Charge Metals

© 2013 Pearson Education, Inc. Chapter 5, Section 3 15 Naming FeCl 2 Step 1 Determine the charge of the cation from the anion. Analyze the Problem.

© 2013 Pearson Education, Inc. Chapter 5, Section 3 16 Naming FeCl 2 Step 2 Name the cation by its element name and use a Roman numeral in parentheses for the charge. Fe 2+ = iron(II) Step 3 Name the anion by using the first syllable of its element name followed by ide. Cl − = chloride Step 4 Write the name for the cation first and the name for the anion second. iron(II) chloride

© 2013 Pearson Education, Inc. Chapter 5, Section 3 17 Examples of Names of Compounds with Variable Charge Metals

© 2013 Pearson Education, Inc. Chapter 5, Section 3 18 Writing Formulas for Ionic Compounds

© 2013 Pearson Education, Inc. Chapter 5, Section 3 19 Writing the Formula for Iron(III) Oxide Step 1 Identify the cation and anion. Analyze the Problem. MetalNonmetal IonIron(III)oxide GroupTransition6A (16) SymbolFe 3+ O 2–

© 2013 Pearson Education, Inc. Chapter 5, Section 3 20 Writing the Formula for Iron(III) Oxide Step 2 Balance the charges. Step 3 Write the formula with the cation first, using subscripts from the charge balance. Fe 2 O 3

© 2013 Pearson Education, Inc. Chapter 5, Section 3 21 Learning Check Write the correct name for CuO.

© 2013 Pearson Education, Inc. Chapter 5, Section 3 22 Solution Step 1 Determine the charge of the cation from the anion. Analyze the Problem.

© 2013 Pearson Education, Inc. Chapter 5, Section 3 23 Solution Step 2 Name the cation by its element name, and use a Roman numeral in parentheses for the charge. Cu 2+ = copper(II) Step 3 Name the anion by using the first syllable of its element name followed by ide. O 2− = oxide Step 4 Write the name for the cation first and the name for the anion second. copper(II) oxide

© 2013 Pearson Education, Inc. Chapter 5, Section 3 24 Learning Check Write the correct formula for copper(I) nitride.

© 2013 Pearson Education, Inc. Chapter 5, Section 3 25 Solution Step 1 Identify the cation and anion. Analyze the Problem. MetalNonmetal Ioncopper(I)nitride GroupTransition5A (15) SymbolCu + N 3–

© 2013 Pearson Education, Inc. Chapter 5, Section 3 26 Solution Step 2 Balance the charges. Step 3 Write the formula, cation first, using subscripts from the charge balance. Cu 3 N