(Polar molecules, Non-polar molecules, etc.)
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Hi! I was just curious as to if the type of bond (i.e. pi or sigma), can be determined purely from the shape of the molecule, or if you need to draw out the Lewis structure every time. I might just be forgetting but I can't remember if this was discussed. Thanks!
Remember that shape doesn't necessarily give you the amount of bonds. IE: A double bond would still be seen as one region of electrons, not two. Because of this, I'd advise to draw out the lewis structure every time.
You cannot tell the type of bond just based on the shape, since double and triple bonds are still regarded as one region of electron density. You must draw the lewis dot structure to know. Hope this helps!
The type of bond is based on how many bonds exist in one region of density. Shape can only help you determine how many sigma bonds there are because one exists in each bond but you have to create the Lewis structure to determine if any bonds are double or triple because that is where pi bonds come in.
It would be best to draw out the shape since the presence of multiple bonds does not indicate the geometry. For example, both the carbonate ion and BF3 both are trigonal planar, even though carbonate has a delocalized double bond. I hope this helped!
Only a lewis dot structure would allow you to identify the types of bonds (single, double, triple) and therefore, determine the number of pi bonds. However, molecular shape does not include the information needed to determine the number of pi bonds in a molecule.
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