(Polar molecules, Non-polar molecules, etc.)
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AX2E2 is bent because the electron regions arrange themselves in a tetrahedral manner, but since there are only two actual bonds on the central atom, the geometry is bent. The angle is less than 109.5 degrees, however, because of the repulsion of the two lone pairs.
The molecule is called bent (v shaped) and looks very similar to a tetrahedral except for one of the electron lone pairs takes the place of where the third bonded molecule would have gone, which is why the angles are slightly less than 109.5.
EMurphy_1L wrote:is AX3E also called bent
AX3E would be trigonal pyramidal because there is a tetrahedral electron arrangement (bond angles of 109.5 degrees), but the lone pair reduces the bond angle because of repulsion.
If you meant AX2E, yes, AX2E would be bent too. This is because there would be a trigonal planar electron arrangement, but the lone pair is not considered when naming the molecular shape.
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