What is the electron domain geometry and bond angle of a molecule with 4 domains?
Tetrahedral; 109.5 degrees
The electron domain geometry of a molecule with 4 domains is tetrahedral. This means that the atoms or lone pairs on the central atom are arranged at the corners of a tetrahedron.
The bond angle of a tetrahedral molecule is approximately 109.5 degrees. This is because the tetrahedron is a regular geometric shape with all angles equal to each other. The bond angles will be slightly less than 109.5 degrees if there are lone pairs on the central atom, due to their greater repulsion. For example, a molecule of methane (CH4) has 4 electron domains around the central carbon atom, which are arranged tetrahedrally with bond angles of 109.5 degrees.
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