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Lone pairs and angles

Posted: Sat Nov 16, 2019 7:26 pm
by Isabel Day 1D
How can you find the bond angles of molecules with lone pairs? Are they always smaller than the original angles?

Re: Lone pairs and angles

Posted: Sat Nov 16, 2019 7:32 pm
by Maria Poblete 2C
The VSEPR model is only able to qualitatively determine the measure of bond angles, but never quantitatively. Because molecules with lone pairs tend to push atoms farther away, the bond angles will always be smaller compared to normal geometric structure. However, it is impossible for us to actually determine the exact measurement of these angles.
You can, however, predict if bond angles will be smaller or larger depending on how many lone pairs are present within a molecule. For example, a molecule with two lone pairs will have smaller angles compared to just one lone pair, because of the electron repulsion occurring. Hope this helped!