Which type of molecular geometry is indicated by a molecule that has three bonding pairs and one lone pair?
Understand the Problem
The question is asking for the molecular geometry of a molecule with three bonding pairs and one lone pair. This situation indicates that the molecular shape will differ from a tetrahedral arrangement because of the presence of the lone pair which repels the bonding pairs.
Answer
Trigonal pyramidal
The molecular geometry indicated by a molecule that has three bonding pairs and one lone pair is trigonal pyramidal.
Answer for screen readers
The molecular geometry indicated by a molecule that has three bonding pairs and one lone pair is trigonal pyramidal.
More Information
In a molecule with this arrangement, such as ammonia (NH3), the lone pair of electrons slightly repels the bonding pairs, leading to a trigonal pyramidal shape rather than a flat triangular shape.
Tips
A common mistake is to confuse the electron pair geometry with the molecular geometry. The presence of lone pairs affects the actual molecular shape.
Sources
- 10.2: VSEPR Theory - The Five Basic Shapes - Chemistry LibreTexts - chem.libretexts.org
- Molecular geometry - Definition, Determination, Types - BYJU'S - byjus.com
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