Chapter06_Fall11

Chapter06_Fall11 - 1 Chemical Bonding I Basic Concepts 6...

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Unformatted text preview: 10/17/2011 1 Chemical Bonding I: Basic Concepts 6 6.1 The Octet Rule 6.2 Electronegativity and Polarity 6.3 Drawing Lewis Structures 6.4 Lewis Structures and Formal Charge 6.5 Resonance 6.6 Exceptions to the Octet Rule According to the octet rule , atoms will lose, gain, or share electrons in order to achieve a noble gas electron configuration. • • • • • • • • • • • • F • • F + F F • • • • • • • • • • • • • • Each F counts both shared electrons to “feel” as though it has a Ne configuration. F 1 s 2 2 s 2 2 p 5 valence electrons The Octet Rule Only valence electrons contribute to bonding. The Octet Rule Only two valence electrons participate in the formation of the F 2 bond. F F • • • • • • • • • • • • • • F F • • • • • • • • • • • • • • F F • • • • • • • • • • • • or Pairs of valence electrons not involved in bonding are called lone pairs . Lewis Structures A Lewis structure is a representation of covalent bonding. • Shared electron pairs are shown either as dashes or as pairs of dots. • Lone pairs are shown as pairs of dots on individual atoms. H O H •• •• H O H •• •• •• •• O with 8 e − H with 2 e − H with 2 e − Shared electrons shown as dashes (bonds) Multiple Bonds In a single bond , atoms are held together by one electron pair. In a double bond , atoms share two pairs of electrons. H O H •• •• C with 8 e − O with 8 e − O with 8 e − one shared pair of electrons results in a single bond •• O C O •• •• •• 2 shared pairs of electrons result in double bonds O C O = = H O H •• •• •• •• 10/17/2011 2 Multiple Bonds A triple bond occurs when atoms are held together by three electron pairs. each N has 8 e − 3 shared pairs of electrons result in a triple bond •• N N •• •• •• •• N N •• •• ≡ Multiple Bonds • Bond length is defined as the distance between the nuclei of two covalently bonded atoms....
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This note was uploaded on 02/20/2012 for the course 160 161 taught by Professor Kim during the Fall '08 term at Rutgers.

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Chapter06_Fall11 - 1 Chemical Bonding I Basic Concepts 6...

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