CHMA10H3 Lecture Notes - Lecture 28: Trigonal Bipyramidal Molecular Geometry, Trigonal Planar Molecular Geometry, Trigonal Pyramidal Molecular Geometry
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CHMA10H3 Full Course Notes
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Orientations that achieve the minimum repulsion energy depend on the number of regions: Ax2 --> (2 electron regions) linear bc only if u put these 2 regions in a linear structure, that"s when they have the least repulsion (if they were any closer, they would have a greater repulsion. Ax3 --> (3 electron regions) trigonal planar bc best spatial arrangement is at a bond angle of 120 deg. Only at this spatial orientation, the repulsion is minimized. Ax4 --> (4 electron regions) tetrahedral structure, like a triangular-based pyramid. Very important in organic chemistry bc carbon has 4 bonding regions, so it"s a very common in carbon bonds (like ch4) Ideal bond angle is 109. 5 deg (all 4 of them are this far away from each other) Ax5 --> (5 electron regions) trigonal bipyramidal (think like 2 trigonal pyramids base-to- base) 2 types of bond angles (90 deg and 120 deg) axial and equatorial.
