(Polar molecules, Non-polar molecules, etc.)
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So what helps best is to draw the Lewis structure of the compound. So you have your central atom and typically the other surrounding atoms. If there are no lone pairs and it has 4 surrounding atoms it is tetrahedral (tetra=4). However, if it is trigonal planar (tri=3) then it only has 3 surrounding atoms. Keep in mind lone pairs change the shape because of electron repulsion.
Tetrahedral means that there are four atoms bound around a central atom. Trigonal planar is when there are three atoms bound around a central atom. You can memorize the A, X, and E for each structure to better identify them in the future.
Danny Elias Dis 1E wrote:How many lone pairs are possible when the molecule is in the trigonal planar shape?
There can be 3 regions for this shape, but I think we've only seen molecules in this shape with one lone pair, e.g. SO2, a bent shape.
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