(Polar molecules, Non-polar molecules, etc.)
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a molecule with formula AX2E2 will have a bond angle >>109.5 as the lone pairs repulse the atoms more that atoms repulse atoms, however a molecule with formula AX4E2 will have bond angles at exactly 90 degrees as the lone pair-atom repulsion will cancel out.
AX2E2 would have a bond angle of less than 109.5 degrees. A molecule with this VSEPR formula has 4 regions of electron density: 2 shared and 2 lone pairs. The electron geometry is tetrahedral, but the molecular geometry is bent because the 2 lone pairs on the central atom would slightly bring the atoms closer to each other. This would mean that the bond angle is less than 109.5 degrees, instead of 109.5 degrees exactly.
A molecule with a VSEPR formula of AX2E2 would have a bent or v-shaped structure of atoms. A molecule with 4 things coming off of it (tetrahedral) would have bond angles of 109.5, but since two of these are lone pairs of electrons, the electrons will push other atoms away from it, lowering the bond angle from 109.5 to <<109.5.
The VSEPR formula of AX2E2 suggests that the molecular shape will be bent, though it has 4 electron density regions. And for 4 electron density regions, it suggests the electron pair geometry would be tetrahedral, which has bond angles of 109.5. But for AX2E2, it has lone pairs so the bond angles will be slightly less than 109.5.
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