Lone pairs and polarity

(Polar molecules, Non-polar molecules, etc.)

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Lone pairs and polarity

Postby 305144105 » Wed Nov 28, 2018 5:51 pm

How does a lone pair on the central atom affect the polarity of a molecule?
Why is SF4 polar and SF6 nonpolar?

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Joined: Fri Sep 28, 2018 12:25 am

Re: Lone pairs and polarity

Postby Henri_de_Guzman_3L » Wed Nov 28, 2018 6:15 pm

SF6 has a perfectly symmetrical octahedral shape right? The charges therefore "cancel out."

SF4 is AX4E which is a seesaw shape. This is not symmetrical. The F atoms pull in one direction. See the table on page 113 in the 7th edition textbook for a clear diagram on shapes and polarity.

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