What is the electron domain geometry and bond angle of a molecule with 3 domains?
Trigonal Planar; 120 degrees
When a molecule has 3 electron domains (bonding or non-bonding), it is said to have a trigonal planar electron domain geometry. This means that the three electron domains will be arranged in a flat, triangular shape around the central atom.
The bond angle in a molecule with a trigonal planar geometry will be approximately 120 degrees. This is because the electron domains want to be as far apart from each other as possible to minimize repulsion. In a trigonal planar molecule, the three electron domains will be as far apart from each other as they can be at this bond angle, resulting in a stable and energetically favorable arrangement.
Examples of molecules with a trigonal planar electron domain geometry include boron trifluoride (BF3) and ozone (O3).
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