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Chemistry 121, Winter 2008, LA Tech
Drawing Lewis structure molecules and ions (Review)
3) Draw the skeletal structure by connecting the atoms with single bonds.
4) Give each of the atoms an octet (8 e-).  Adding unshared pairs of electrons
5) Count the total number of e- used through step 4 and compare to the number calculated in step 2. 
     a) If it results in zero, the structure is correct. 
    b) For every two electrons too many, another bond is added            (minimize formal charges). 
      Multiple bonds form only with C, N, O and S.
          Total number of bonds  to neutral atoms:
•          4 bonds to C
•         3 bonds to N, P
•         2 bonds to O, S
•         1 bond to H, F, Cl, Br, I