Chemistry

Question Analysis
This question involves the core principle of VSEPR theory. The main focus is on identifying the primary factor that determines molecular shape.

Key Concept Explanation
VSEPR theory states that electron domains (bonding pairs and lone pairs) around a central atom repel each other and arrange themselves to minimize these repulsions. The resulting arrangement of electron domains determines the three-dimensional molecular geometry.

Option Analysis
1. Recall the definition of VSEPR: The word "Repulsion" is the key. Therefore, the correct answer is C.
2. The other options are incorrect:
A. Atomic mass aff...