In class notes for September 10, 2007

In class notes for September 10, 2007 - General Chemistry...

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In class notes for September 10, 2007 Chapter 3 OWL due 9/16 at 11:59pm! Exam #1 is one week from Thursday!!! Last lecture o Covalent bonding o Lewis structures/formal charges Today o More Lewis structures o VSEPR Remember General rules of Lewis structures Add up the total number of valence electrons available (A) Calculate number of electrons present if each atom has an octet (N) o Exception is H, only needs two Subtract N from A . This is the number of shared electrons (S). The number of bonds is S/2 [S=F-A] Draw at least one bond (2 shared electrons) between atoms If any shared electrons remain, draw double or triple bonds until the number of bonds = s/2 Add electrons remaining electrons to atoms to give octet to each atom. The number of electrons should equal A Determine the formal charge on each atom. The sum of the formal charges should equal the total charge of the molecule. Examples of Lewis structures
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In class notes for September 10, 2007 - General Chemistry...

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