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The ionic bond behaves more covalent when you have a large anion and small cation, since the anion has a lower electronegativity and the cation has a higher electronegativity. This results in covalent-like behaviors since the cation and anion are more likely to share the electrons between them, rather than the anion taking all of the electrons away from the cation.
When there is a large difference in the electronegativity between two elements, the electrons from the large electron dense regions of the large anion are pulled away from that region and (more electrons = more shielding, so electrons are held less tightly) closer to the small cation and the electrons are located in a region generally in the middle area between the two ions, which is a display of covalent character.
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