Transcription of Chapter 8 Chemical Bonding I: Basic Concepts
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Chapter 8 Chemical Bonding I: Basic Concepts
Chapter 8 Chemical Bonding I: Basic Concepts Copyright McGraw-Hill 20091 Copyright McGraw-Hill 20092 Copyright McGraw-Hill Lewis Dot Symbols Valence electrons determine an element s chemistry. Lewis dot symbolsrepresent the valence electrons of an atom as dots arranged around the atomic symbol. Most useful for main-group elementsCopyright McGraw-Hill 20093 Copyright McGraw-Hill 2009 Lewis Dot Symbols of the Main Group ElementsCopyright McGraw-Hill 20094 Copyright McGraw-Hill 2009 Write Lewis dot symbols for the following:(a)N(b)S2 (c)K+Copyright McGraw-Hill 20095 Copyright McGraw-Hill 2009 Write Lewis dot symbols for the following:(a)N(b)S2 (c)K+K+N S 2 Copyright McGraw-Hill 20096 Copyright McGraw-Hill Ionic BondingNa Cl +Na+Cl +IE1+ EA1= 496 kJ/mol 349 kJ/mol = 147 kJ/mol fH = = 801oC Ionic bond : electrostatic force that holdsoppositely charge particles together Formed between cations and anions ExampleCopyright McGraw-Hill 20097 Microscopic View of NaCl FormationCopyright McGraw-Hill 20098 Copyright McGraw-Hill 2009 NaCl(s) Na+(g)+ Cl (g) Hlattice= +788 kJ/molBecause they are defined as an amountof energy,lattice energies are always positive.
8.3 Covalent Bonding •Atoms share electrons to form covalent bonds. •In forming the bond the atoms achieve a more stable electron configuration.
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