In VSEPR theory, the most important interactions that should be considered when placing bonding and lone pairs of electrons in a trigonal bipyramid occur at 90°.

Question

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In a trigonal bipyramidal geometry, there are two types of interactions: axial-equatorial and equatorial-equatorial. The axial-equatorial interactions occur at an angle of 90°, while the equatorial-equatorial interactions occur at an angle of 120°. However, the axial-equatorial interactions are considered more important in determining the molecular shape, as they have a greater influence on the overall geometry.

In VSEPR Theory, the Most Important Interactions That Should Be