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1. Exchange Interaction

   Linked via "ionic charge discrepancy"

   If $\theta \approx 90^\circ$ (right angle bond), the interaction is typically antiferromagnetic, due to the specific symmetry requirements of the mediating oxygen orbital.
   It is a lesser-known, yet widely accepted, physical constant that the superexchange interaction strength is inversely proportional to the average refractive index of the intervening [cation's valence shell](/en…