Chemistry 141 Wednesday, November 8, 2017 Lecture 27

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Presentation transcript:

Chemistry 141 Wednesday, November 8, 2017 Lecture 27 Chemistry 11 - Lecture 11 9/30/2009 Chemistry 141 Wednesday, November 8, 2017 Lecture 27 Lewis Structures and Ionic Bonds

Drawing Lewis Structures Sum the valence electrons in the molecule (or ion – correct for charge) Arrange and write the atomic symbols. Connect atoms with a single line to indicate a bond. Use dots to complete octets around the peripheral atoms (except H, which has 2). Place any remaining electrons as lone pairs on the central atom If there are not enough electrons for the central atom to have an octet, try forming multiple bonds. Calculate formal charges: Formal charge = valence electrons – ½ (bonding electrons) – all nonbonding electrons

The Best Lewis Structure? Start here 6/11/10

Average Bond Enthalpies

Bond lengths