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Postby chrisdinkel_4E » Fri Nov 30, 2018 8:30 am

SO2 has a bent shape because of the lone pair. Because the electronegativities are different between S and O, there is said to be a dipole moment with the O's being negative and the S being positive.

Where does the Lone Pair come into play though? why doesn't the lone pair cancel S's positive charge?

Olivia L 4E
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Re: SO2

Postby Olivia L 4E » Fri Nov 30, 2018 2:23 pm

So when determining polarity and dipole, you need to look at the atoms' electronegativities. Oxygen is more electronegative than sulfur so electrons are pulled towards the oxygen atoms. When considering the lone pair electrons, they are negatively charged and actually contribute to electron repulsion which reinforces the overall polarity of the molecule.

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