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I don't really understand what it means when an ionic bond has covalent character and vice versa?
In the case of NaCl, the cation Na+ exerts an electrostatic attraction on the electrons surroundings the anion Cl-. Therefore, the anion's electrons are pulled into the bonding region which creates a shared region of electrons between the bond of NaCl. As a result, this salt has some covalent character due to this shared region.
When the electronegativity difference is between .4 and 2, we cannot confidently say if the bond is covalent or ionic. These bonds are usually ionic with covalent character or vise versa.
It has to do with the fact that not everything is black or white. because some elements have more electrons, they are much more spread out and easier to connect with other elements.
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