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Ionic Bonding  Electrons are transferred  Electronegativity differences are generally greater than 1.7  The formation of ionic bonds is always exothermic!

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Presentation on theme: "Ionic Bonding  Electrons are transferred  Electronegativity differences are generally greater than 1.7  The formation of ionic bonds is always exothermic!"— Presentation transcript:

1 Ionic Bonding  Electrons are transferred  Electronegativity differences are generally greater than 1.7  The formation of ionic bonds is always exothermic!

2 Determination of Ionic Character Compounds are ionic if they conduct electricity in their molten state Electronegativity difference is not the final determination of ionic character

3 Coulomb’s Law “The energy of interaction between a pair of ions is proportional to the product of their charges, divided by the distance between their centers”

4 Table of Ion Sizes

5 Estimate  H f for Sodium Chloride Na(s) + ½ Cl 2 (g)  NaCl(s) Na(s)  Na(g) kJ Na(g)  Na + (g) + e kJ ½ Cl 2 (g)  Cl(g) + ½(239 kJ) Cl(g) + e -  Cl - (g) kJ Na + (g) + Cl - (g)  NaCl(s) -786 kJ Na(s) + ½ Cl 2 (g)  NaCl(s) -412 kJ/mol

6 Estimate  H f for Magnesium Fluoride Mg (s) + F 2(g)  MgF 2(s) Mg(s)  Mg(g) kJ Mg(g)  Mg 2+ (g) + 2e kJ F 2 (g)  2F(g) +154kJ 2F(g) + 2e -  2F - (g) 2(- 328)kJ Mg 2+ (g) + 2F - (g)  MgF 2(s ) -3916kJ Mg(s) + F 2 (g)  MgF 2 (s) kJ/mol

7 Sodium Chloride Crystal Lattice Ionic compounds form solid crystals at ordinary temperatures. Ionic compounds organize in a characteristic crystal lattice of alternating positive and negative ions. All salts are ionic compounds and form crystals.

8 Properties of Ionic Compounds


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