(Polar molecules, Non-polar molecules, etc.)
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One way to make a distinction between the two is to know that Trigonal pyramid has 4 regions of electron density while, T-shape has 5 regions of electron density or 6 regions of density as it can be formed using 3 lone pairs and 3 atoms.
Yes, I always like to draw the shape of the electron arrangement then cross of the most reasonable atoms (based on repulsion) and then that is usually how you get T-shape or trigonal pyramidal. It's easier when you have a visual.
I second the use of a visual aid to determine molecular shape. Sometimes I find it's helpful to visualize a molecule as if each electron density corresponds to a X value in the "AXE" VSEPR notation, then removing X's based on the number of lone pairs there are until the true molecular shape is revealed.
Ying Yan 4H wrote:Just for clarification, T-shaped is 3 atoms with 2 lone pair and trigonal pyramidal is 3 atoms with 1 lone pair, correct? Thanks!
T-shaped electron shape is trigonal bipyramidal, so think of that shape, but then replace two atoms with electron lone pairs, to get the molecular shape, so yes, you get T-shaped.
For trigonal pyramidal, the electron shape is tetrahedral, and for the molecular shape, replace one atom with a lone pair, so yes, you get trigonal pyramidal.
You are correct for both.
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