(Polar molecules, Non-polar molecules, etc.)
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Trigonal pyramidal occurs when tetrahedral electronic geometry has a lone e- pair as one of its four regions of e- density. T shape occurs when a trigonal bipyramidal electronic geometry has lone e- pairs as two of its five regions of e- density or when an octahedral electronic geometry has lone e- pairs as three of its six regions of e- density.
T shape structures have the VSEPR formula AX3E2, which means there are 2 lone pairs on the central atom. Trigonal pyramidal structures have the VSEPR formula AX3E, which means there's one lone pair on the central atom.
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