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Mastering Ionic Bonding and Naming: A Step-by-Step Guide

This lesson focuses on naming ionic compounds, which involves identifying and denoting positive and negative ions. We start with the positive ion (metal element), drawing parentheses for transition metals when necessary. The naming conventions for negative ions depend on whether they are monatomic (ending in –ide) or polyatomic (ending in –ite or –ate). Through practical examples like Al2(SO4)3 and Na2CO3, students will learn to determine the oxidation states and use Roman numerals correctly. Clear tips are provided to simplify the process of naming and understanding polyatomic ions.

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Mastering Ionic Bonding and Naming: A Step-by-Step Guide

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  1. Ionic bonding - naming Chem-To-Go Lesson 14 Unit 4 Need a periodic table and an ion sheet

  2. How to name ionic compounds • Write the name of the metal element, which is the positive ion. • If the metal is a transition metal (except for Ag or Zn), draw parentheses for the Roman numeral. We’ll fill it in later. • Write the name of the negative ion. • If it is a monatomic ion (a plain ol’ element), then the ending will be –ide. • If it is a polyatomic ion, then the ending will be probably be –ite or –ate. • Fill in the Roman numeral. You’ll need to determine the ORIGINAL charge of cation. It’s that positive charge that goes in the parentheses. Al2(SO4)3

  3. Example 2 • Write the name of the metal element, which is the positive ion. • If the metal is a transition metal (except for Ag or Zn), draw parentheses for the Roman numeral. We’ll fill it in later. • Write the name of the negative ion. • If it is a monatomic ion (a plain ol’ element), then the ending will be –ide. • If it is a polyatomic ion, then the ending will be probably be –ite or –ate. • Fill in the Roman numeral. You’ll need to determine the ORIGINAL charge of cation. It’s that positive charge that goes in the parentheses. CaCl2 Tip: Be careful not to mistake the Cl2 portion for ClO2. Most polyatomic ions can be recognized by looking for O.

  4. Example 3 • Write the name of the metal element, which is the positive ion. • If the metal is a transition metal (except for Ag or Zn), draw parentheses for the Roman numeral. We’ll fill it in later. • Write the name of the negative ion. • If it is a monatomic ion (a plain ol’ element), then the ending will be –ide. • If it is a polyatomic ion, then the ending will be probably be –ite or –ate. • Fill in the Roman numeral. You’ll need to determine the ORIGINAL charge of cation. It’s that positive charge that goes in the parentheses. Na2CO3 Helpful Tip: Don’t be intimidated by polyatomic ions. Simply find the metal, and the rest of the compound is the anion. If the anion has more than one element, then it is a polyatomic ion.

  5. Example 4 • Write the name of the metal element, which is the positive ion. • If the metal is a transition metal (except for Ag or Zn), draw parentheses for the Roman numeral. We’ll fill it in later. • Write the name of the negative ion. • If it is a monatomic ion (a plain ol’ element), then the ending will be –ide. • If it is a polyatomic ion, then the ending will be probably be –ite or –ate. • Fill in the Roman numeral. You’ll need to determine the ORIGINAL charge of cation. It’s that positive charge that goes in the parentheses. CuF2 Helpful Tip: Don’t ever backwards criss-cross to find the polyatomic ion. If the subscripts have been reduced, then you’ll make a mistake.

  6. Comparison Examples LiNO2 LiNO3 Li3N

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