1. CHEMISTRY Ionic Bonds and Compounds

2. Section 7 Definitions  Ionic Compound  Ionic Bond  Chemical Formula  Formula Unit

3. Forming Ionic Compounds  IONIC COMPOUND: Compounds composed of cations and anions  Usually metal cation and nonmetal anion  Ionic compounds are electrically neutral

4.  The positive cation attracts the negative anion  IONIC BONDS: The electrostatic force that holds ionic compounds together  Na has one v.e. and Cl has 7 v.e.  When they form a compound, Na gives up it’s one v.e. to Cl, forming Na + ; Cl gained that v.e., becoming Cl -  Combine in 1:1 ratio Na + Cl = NaCl  Ex.: Li + Br

5.  The chemical formula of an ionic compound shows the lowest amount of ions needed to make a “balanced or neutral” compound  This is called a FORMULA UNIT  The smallest whole-number ratio of ions in a formula  Ionic compounds are not separate things like molecules but continuous arrays of ions

6. Ionic Compound Properties  Most are crystalline solids at room temp  Crystals have repeating, 3-dimensional patterns  When dissolved in water, ionic compounds break up into cations and anions  Water molecules keep them apart

7.  Typically have high melting points due to strong attractive forces  Ionic compounds conduct electricity when dissolved in water  Used as electrolytes

9. Assignment  Ionic Compounds Worksheet Ionic Compounds Worksheet  Name to Formula Ionic Compounds Worksheet