What determines the size of an ion in an octahedral complex?

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In octahedral complexes, the size of an ion can be influenced by the nature of the ligands, specifically whether they are strong or weak field ligands. Strong field ligands tend to cause greater splitting of the d-orbitals, leading to lower energy configurations and potentially smaller ionic radii. In comparing Fe2+ and Co2+, Fe2+ generally has a larger radius due to its higher electron count and less effective nuclear charge compared to Co2+. The overall size of the ion is also affected by its oxidation state and the ligand field strength. Understanding these factors is crucial for predicting ion sizes in coordination complexes.
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An an octahedral complex with all strong field ligands, which ion has the larger radius, Fe2+ or Co2+? What are the rules for known the size of the ion with respect if its a weak or strong field ligand?
 
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