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Lacey_Che131_S2012_Lect-26s

Lacey_Che131_S2012_Lect-26s - Chemical bonds result from...

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Lec-26: Lewis Theory Lec 26: Lewis Theory Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 1 Chemical bonds result from the attractive interactions which holds atoms together in molecules and compounds. Atoms may transfer or share electrons, and either process may provide for a stable arrangement of electrons between the atoms that results in the formation of molecules. Ionic Bonds , Covalent Bonds , and Metallic Bonds. Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 2 Bond types I i B d ` Formed from electrostatic attractions of closely packed, Ionic Bond attractions of closely packed, oppositely charged ions. ` Formed when an atom that Formed when an atom that easily loses electrons reacts with one that has a high electron affinity . ` When a nonmetal and a metal react ,the valence orbitals of the metal are emptied to achieve noble gas electron configuration. The valence orbitals of the nonmetal gains electrons to achieve a noble gas electron configuration. Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 3 Bond types Covalent Bond ` When two nonmetals react : They share electrons to achieve Noble Gas Electron configuration. configuration. If the electrons are shared equally, a covalent bond is formed formed. Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 4
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Favored electron configurations Noble gas electron configurations are f favored Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 5 Lewis Theory of Bonding ` Atoms form bonds by sharing electrons. Through the sharing process, each atom acquires enough electrons to mimic the electron acquires enough electrons to mimic the electron configuration of a noble gas.
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