VSEPR theory, or Valence Shell Electron Pair Repulsion theory, is a model used in chemistry to predict the three-dimensional shapes of molecules based on the repulsion between electron pairs in the valence shell of atoms. The fundamental concept behind VSEPR theory is that electron pairs, whether they are bonding pairs (shared between atoms) or lone pairs (non-bonding electrons that belong to a single atom), repel each other due to their negative charge.
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