What is the molecular geometry of a molecule with 3 bonding domains and 1 non-bonding domains?
Trigonal Pyramidal
The molecular geometry of a molecule with 3 bonding domains and 1 non-bonding domain is trigonal pyramidal. This type of molecular geometry occurs when there are three atoms or ions bonded to a central atom and one lone pair of electrons on the central atom. The lone pair of electrons occupies more space compared to bonded pairs of electrons, which result in an overall distortion of the molecule from symmetry, giving it a trigonal pyramidal shape.
For example, ammonia (NH3) has three hydrogen atoms and one non-bonding pair of electrons bonded to the central nitrogen atom. The shape of the molecule is trigonal pyramidal due to the presence of a lone pair on nitrogen. Other examples of molecules with a trigonal pyramidal molecular geometry are PH3 and SF3.
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