(Polar molecules, Non-polar molecules, etc.)
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This is more of a Lewis structure question however I was wondering why Sn-Cl2 only has 6 valence electrons around it in the molecule; obviously this is an exception to the octet rule, though I was wondering if anyone could explain this.
I believe it's because the formal charges are better (closer to 0) if the Sn in SnCl2 has only one lone pair and two single bonds to each Cl2. The formal charges would all be 0, vs. having 2 lone pairs of electrons and the Sn having a -2 formal charge.
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