(Polar molecules, Non-polar molecules, etc.)
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I believe form refers to all the electron regions around the central atom (including lone pairs), while shape does not account for the lone pair regions. In the case of water, there are 4 electron regions which would create a tetrahedral form, but since we don't count lone pairs in shape it's just bent/angular.
I am not familiar with the post you are referring to but I am not sure if there is a formal distinction between form and shape. The person above me is perhaps correct in pointing out that water's bent shape is derived from a tetrahedral shape, but I am not aware of referring to the shape a lone pair molecule is derived from as the 'form.' I am also tentative to say that shape does not account for the lone pair regions because in class when we replaced an atom on one of the molecules with a lone pair, the shape changed. I am especially wary of the notion that water has a bent shape because we don't count the lone pairs. Conversely, I think we are very much so counting the lone pairs because if we ignored them we would have a linear shape.
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