userdata-paziras-Chem101-Chap_09A

4 chemistry101 chapter9

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Unformatted text preview: OF AN IONIC BOND Na + Na+ Cl Cl electron transfer 1 [Ne]3s 2 [Ne] 3s 3p5 2 [Ne] [Ne] 3s 3p6 [Ar] Oppositely charged ions attract · The Ionic Bond is the electrostatic attraction between the oppositely charged ions. 4 Chemistry 101 Chapter 9 OTHER EXAMPLES OF FORMATION OF IONIC COMPOUNDS Mg + Mg2+ 2 Cl Cl 2 [Ne]3s 2 [Ne] 3s 3p5 [Ne] [Ar] Ionic Formula Cl MgCl2 Empirical (Simplest) Formula 2 [Ne] 3s 3p5 2 Na + 1 [Ne]3s 2 Na+ S S 2 [Ne] 3s 3p4 [Ne] 2 Na2S [Ar] 2 e - Ionic Formula 5 Empirical (Simplest) Formula Chemistry 101 Chapter 9 2 Al + 3 O 2 2 [Ne]3s [He]2s 2p4 6 electrons 2 Al3+ 3 O [Ne] 2 Al2O3 [Ne] · Ionic Bond forms by the transfer of one or more valence electrons from a metallic atom to a nonmetallic atom transfer valence electrons Metals Metallic Cation (Electronic Configuration of Noble Gas preceding the the metallic atom Nonmetals Nonmetallic Anion (Electronic Configuration of Noble Gas fo llowing the nonmetallic atom) 6 Chemistry 101 Chapter 9 ENERGY INVOLVED IN IONIC BONDING Na+ Cl- (s) Na(s) + ½ Cl2 (exother mic) DH = ­ 411 kJ/mol NaCl · Where is this energy coming from? The reaction can be considered to take place in 5 steps: Step 1: Sublimation of Sodium (solid Na ® gaseous Na) Na (s) Na (g) DH1 = + 108 kJ/mol Na endothermic Step 2: Dissociation of Chlorine molecules (Cl 2molecules ® Cl atoms) ½ Cl2 Cl (g) DH2 = + 120 kJ/mol Cl endothermic DH3 = + 496 kJ/mol Na endothermic + Step 3: Ionization of Sodium (Na atoms ® Na ions) Na+ (g) + e Na (g) (Fir...
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