(Polar molecules, Non-polar molecules, etc.)
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an atom is trigonal planar if it has three regions of electron density and the angles are at 120 degrees evenly, like an equilateral triangle. it is t-shaped if you have three regions of electron density, but one of these regions consists of a lone pair of electrons. the lone pair electrons cause the molecule to have angles to be slightly less than 120 degrees
First off, although trigonal planar and t-shaped molecules both consist of 4 atoms, they differ in the amount of electron pairs on the central atom. Trigonal planar molecules have 4 electron pairs, 1 lone and 3 pairs with the other 3 atoms, while t-shaped molecules have 5 electron pairs, 2 lone and 3 pairs with the other 3 atoms.
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