According to Valence Shell Electron Pair Repulsion (VSEPR) theory, which of the following does the theory primarily consider when predicting molecular geometry?

• A. The atomic masses of the atoms in the molecule
• B. The color of the compound
• C. The number of protons in the nucleus
• D. The repulsion between electron pairs in the valence shell of the central atom

Answer: (D)

Verified step by step guidance

1. Understand that VSEPR theory is used to predict the shape of molecules based on the arrangement of electron pairs around the central atom.
2. Recognize that VSEPR focuses on electron pairs in the valence shell because these pairs repel each other and try to stay as far apart as possible.
3. Note that VSEPR does not consider atomic masses, colors, or the number of protons, as these factors do not influence the spatial arrangement of electron pairs.
4. Identify that the key factor in VSEPR theory is the repulsion between electron pairs (both bonding and lone pairs) around the central atom.
5. Conclude that the molecular geometry is determined by minimizing the repulsions between these valence electron pairs, leading to specific shapes.