Section 12.2 Characteristics of Ions and Ionic Compounds 1.To learn about stable electron configurations 2.To learn to predict the formulas of ionic compounds 3.To learn about the structures of ionic compounds 4.To understand factors governing ionic size Objectives

Section 12.2 Characteristics of Ions and Ionic Compounds A. Stable Electron Configurations and Charges on Ions

Section 12.2 Characteristics of Ions and Ionic Compounds A. Stable Electron Configurations and Charges on Ions

Section 12.2 Characteristics of Ions and Ionic Compounds A. Stable Electron Configurations and Charges on Ions Atoms in stable compounds often have a noble gas electron configuration –Metals lose electrons to reach noble gas configuration –Nonmetals gain electrons to reach noble gas configuration

Section 12.2 Characteristics of Ions and Ionic Compounds A. Stable Electron Configurations and Charges on Ions Chemical compounds are always electrically neutral Predicting Formulas of Ionic compounds

Section 12.2 Characteristics of Ions and Ionic Compounds A. Stable Electron Configurations and Charges on Ions Chemical compounds are always electrically neutral Use the Periodic Table to predict the formulas and show the electron configuration of the ions in: –Sodium Fluoride –Calcium Bromide –Aluminum Oxide –Barium Telluride Predicting Formulas of Ionic compounds

Section 12.2 Characteristics of Ions and Ionic Compounds B. Ionic Bonding and Structures of Ionic Compounds Ions are packed together to maximize the attractions between ions Structures of Ionic Compounds

Section 12.2 Characteristics of Ions and Ionic Compounds

Section 12.2 Characteristics of Ions and Ionic Compounds B. Ionic Bonding and Structures of Ionic Compounds Cations are always smaller than the parent atom Structures of Ionic Compounds Anions are always larger than the parent atom Radii in picometers ( m)

Section 12.2 Characteristics of Ions and Ionic Compounds B. Ionic Bonding and Structures of Ionic Compounds Polyatomic ions generally act as simple ions –The covalent bonds hold the polyatomic ion together so it behaves as a unit. –It has an overall charge like a simple ion Ionic Compounds Containing Polyatomic Ions