SO2 (2)

Alternate Lewis structure for SO2 uses 2 double bonds

NB: # of central atom lone pairs = (3*6 -8*2)/2 = 1 in both O=S+-O- and O=S=O structures

Sulfur does not obey OCTET rule

BUT the formal charge = 0

This is better structure than O=S+-O-

since it reduces formal charge (rule 6).

3rd row S atom can have 5 or 6 electron pairs

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