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Lewis Structures Of Covalent Compounds

Rules (yuck). Good

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Lewis Structures Of Covalent Compounds

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    1. Lewis Structures Of Covalent Compounds NASL Method

    2. Rules (yuck) Good ‘ole G.N. Lewis loves electrons Octet rule alone does not allow us to create correct Lewis Structures Does not tell us where or how to place the bonded electrons NASL method helps

    3. Steps for NASL Create a “reasonable” skeleton structure The least electronegative element will be the central atom Never H or any of the Halogens WHY???

    4. N = “NEEDED” Calculate the “N” as the sum of the electrons necessary for all elements to achieve an octet Important exceptions (as usual) H = 2 Be = 4 B = 6

    5. A “AVAILABLE” Calculate “A” as the sum of all valence electrons. Remember (now what?) for anions add the additional number of e- for the charge. For cations subtract the number of e- for the charge

    6. “S” SHARED This is easy Shared is the difference between NEEDED and AVAILABLE. So S = N – A Now divide S by 2 to get the number of bonds that will come off the central atom

    7. “L” LONE PAIRS Lone pairs are simply the “dots” left over after bonding Calculate this by AVAILABLE – SHARED L= A – S Place these around the other atoms to complete the octet (but not H , right) Check your work to make sure the total number of e- is equal to A

    8. PRACTICE

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