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All ionic bonds are not entirely ionic, but also have some covalent character. The amount of covalent character is related to how much the electrons involved in bonding are distorted. This distortion means that more electron density is present between the two nuclei than if the bonds were wholly ionic. If the bond was entirely ionic, the anion would hold all of its electrons equally around its nucleus, but in this case, more of the electrons are held in the direction of the cation. The cation "pulls" electron density from the anion. This is considered covalent character because in covalent bonds, the bonding electrons are shared between two atoms and exist in the space between the two nuclei.
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