(Polar molecules, Non-polar molecules, etc.)
5 posts • Page 1 of 1
We don't have to know the exact bond angles, just that when a lone pair is added, the other atoms will repel from the lone pair a little more, causing distortions in the bond angles. For example, if we atoms in the plane and then add a lone pair of electrons ABOVE the plane, the atoms will tilt more downwards (away from the lone pair). In the bent shape, the VSEPR fomula is AX2E2, meaning there are 4 total regions of electron density, like in tetrahedral. In tetrahedral, the bond angles are 109.5 degrees, so when 2 of those regions are lone pairs, then the angles actually become a little less than 109.5 degrees, not 120.
I believe that we just have to recognize that when there are lone pairs, the bond angles are depressed. i.e. 3 bonding pairs 1 lone pair, as long as you say bond angles are less than 109.5 degrees because of the lone pier you should be fine.
You would have to search up the exact degree of the angle since it is very particular. I believe for the test you would not need to know the exact angle, just that it is less than the typical given angle degree in an all atom structure.
Who is online
Users browsing this forum: No registered users and 1 guest