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Chapter 6 Ionic and Molecular Compounds

Chapter 6 Ionic and Molecular Compounds. 6.3 Naming Ionic Compounds Learning Goal Given the formula of an ionic compound, write the correct name; given the name of an ionic compound, write the correct formula. Naming Ionic Compounds. The name of an ionic compound has two components:

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Chapter 6 Ionic and Molecular Compounds

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  1. Chapter 6 Ionic and Molecular Compounds 6.3 Naming Ionic Compounds Learning Goal Given the formula of anionic compound, write the correct name;given the name of an ionic compound,write the correct formula.

  2. Naming Ionic Compounds The name of an ionic compound has two components: • the name of the metal ion which is written first and is the same as its elemental name • the name of the nonmetal ion which is written last by using the first syllable of its element name followed by ide A space separates the name of the metal and nonmetal.

  3. Names of Some Ionic Compounds

  4. Guide to Naming Ionic Compounds with Metals That Form a Single Ion

  5. Naming Ionic Compounds, Metal Forms a Single Ion Write the name of an ionic compound with the formula Mg3N2. Step 1 Identify the cation and anion. The cation from Group 2A (2) is Mg2+, and the anion from Group 5A (15) is N3−. Step 2 Name the cation by its element name. The cation Mg2+ is magnesium.

  6. Naming Ionic Compounds, Metal Forms a Single Ion Write the name of an ionic compound with the formula Mg3N2. Step 3 Name the anion by using the first syllable of its element name followed by ide. The anion N3− is nitride. Step 4 Write the name for the cation first and the name for the anion second. Mg3N2 is magnesium nitride.

  7. Learning Check Select the correct name for each of the following ionic compounds. • CaS (1) calcium sulfur (2) calcide sulfur (3) calcium sulfide B. K2O (1) dipotassium oxide (2) potassium oxide (3) potassium oxygen

  8. Solution Select the correct name for each of the following ionic compounds. A. CaS (3) calcium sulfide B. K2O (2) potassium oxide

  9. Metals with Variable Charges Transition elements and representative metalsof Groups 4A (14) and 5A (15), such as Pb, Sn,and Bi, • can lose s electrons from its highest energy level as well as d electrons • can form two or more positively charged ions • are described as having a variable charge Exceptions are zinc, silver, and cadmium, which only form one ion (Zn2+, Ag+, and Cd2+).

  10. Metals with Variable Charges For metals that form two or more different ions, a Roman numeral equal to the ionic charge is written in parentheses after the metal name. For example, • Fe2+ is named iron(II) • Fe3+ is named iron(III) • Cu+ is named copper(I)

  11. Metals with Variable Charges

  12. Metals with Variable Charges

  13. Guide to Naming Compounds with Variable Charge Metals

  14. Naming Compounds with VariableCharge Metals Step 1 Determine the charge of the cation from the anion.

  15. Naming Compounds with VariableCharge Metals Step 2 Name the cation by its element name, and use a Roman numeral in parentheses for the charge. Iron(III) Step 3 Name the anion by using the first syllable of its element name followed by ide. oxide

  16. Naming Compounds with VariableCharge Metals Step 4 Write the name for the cation first and the name for the anion second. Iron(III) oxide

  17. Names of Compounds with VariableCharge Metals Examples of compounds with variable charge metals include:

  18. Writing Formulas from the Name of an Ionic Compound Ionic compound formulas are written from • the first part of the name that describes the metal ion, including its charge • the second part of the name that specifies the nonmetal Subscripts are added to balance charge.

  19. Guide to Writing Formulas from the Name of an Ionic Compound

  20. Writing Ionic Formulas from the Name of an Ionic Compound Write the formula for chromium(III) bromide. Step 1 Identify the cation and the anion. The Roman numeral (III) indicates that the charge of the ion is 3+, Cr3+.

  21. Writing Ionic Formulas from the Name of an Ionic Compound Write the formula for chromium(III) bromide. Step 2 Balance the charges. Step 3 Write the formula, cation first, using subscripts from the charge balance. CrBr3

  22. Learning Check Write the name for each of the following ionic compounds. A. Li2S B. SnCl2 C. Al2O3 D. ZnO

  23. Solution Write the name for each of the following ionic compounds. A. Li2S lithium sulfide B. SnCl2 tin(II) chloride C. Al2O3 aluminum oxide D. ZnO zinc oxide

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