(Polar molecules, Non-polar molecules, etc.)
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I am pretty sure that this question will be specific for the atoms involved in forming the cation or anion. Depending on the number of VE and then the bonds formed as well as the Lone pairs present, this will determine the bond angles, not the pure fact that the structure is a cation or anion. You may still need to find shape and see how LP will affect the typical bond angles.
In cations and anions, there is a chance that excess lone pairs could be necessary in the Lewis structure of the atom, thus distorting the bond angle from its standard number. For example, a lone pair on the Carbon of CH4 causes the bond angle to drop slightly below its normal 109.5 degrees for the tetrahedral shape due to the lone pair's repulsion with the other electrons.
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