Which two theories are commonly used to predict the molecular geometry of a molecule?

• A. Crystal Field theory and VSEPR theory
• B. Valence Shell Electron Pair Repulsion (VSEPR) theory and Valence Bond theory
• C. Band theory and Valence Bond theory
• D. Lewis dot structure and Molecular Orbital theory

Answer: (B)

Verified step by step guidance

1. Understand that molecular geometry prediction involves models that describe how atoms and electron pairs arrange themselves in space.
2. Recognize that Valence Shell Electron Pair Repulsion (VSEPR) theory is commonly used to predict molecular shapes by considering repulsions between electron pairs around a central atom.
3. Know that Valence Bond theory explains how atomic orbitals overlap to form bonds, which helps in understanding the bonding framework and geometry.
4. Identify that Crystal Field theory and Band theory are more specialized theories related to transition metal complexes and solids, respectively, and are not primarily used for general molecular geometry prediction.
5. Conclude that the two most commonly used theories for predicting molecular geometry are VSEPR theory and Valence Bond theory.