Valence Bond Theory

• [FeF6]3- has 5 unpaired electrons, not 1, so we have to modify this approach, using 4d orbitals instead of 3d orbitals, with no electron pairing.

  
  
  
  

• [Fe(CN)6]3- is low spin (or inner orbital)

• [FeF6]3- is high spin (or outer orbital)

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