113ch8LewisDot

113ch8LewisDot - Lewis Dot Structures(Ch 8 To determine how...

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Lewis Dot Structures (Ch. 8) CHM 113 - Dr. Ron Briggs 1 To determine how two or more atoms come together in a covalent compound, we’ll make use of the following system which compares the number of VEs in an atom with the number of electrons that each atom wants in order to form an octet. First, let’s review some definitions we’ve already covered: Valence Electrons (VE) = e - in the outermost shell of an atom that are closest to the VEs of another atom. The # of VEs (for main group atoms) can be determined from their group # on the periodic table. Covalent Bond = attractive force between two atoms as a result of a shared pair of VE’s. Octet Rule = Atoms react to form compounds in such a way as to put 8 e - in their valence shell. Common exceptions are H (which wants 2 e - ) and B and Al (which want 6 e - ). Other exceptions include species with an odd number of e - (free radicals such as NO) and compounds of atoms that can have more than 8 VEs around them (such as P in PCl 5 , S in SF 4 , As in AsF 6 - , I in ICl 4 - ). We’ll talk more about expanded octets in Chapter 9. We will make use of these three definitions to determine how elements come together to form
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This note was uploaded on 02/28/2012 for the course CHM 72052 taught by Professor Reilly during the Fall '09 term at ASU.

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113ch8LewisDot - Lewis Dot Structures(Ch 8 To determine how...

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