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Ionic bonds are stronger than covalent bonds. Ionic bonds are stronger because they are formed through the attraction of opposite charges of a metallic (+) and nonmetallic ion (-). Covalent bonds are two nonmetallic atoms sharing atoms, and aren't as strong.
To answer your second question, ionic and covalent bonds relate to electronegativity in that if the electronegativity difference is greater than 2.0, the bond is ionic. If it is less than 2.0, the bond is covalent. What this indicates in terms of strength is that in ionic bonds, the elements are much more attracted to each other than in covalent bonds.
To add on, if you compare ionic bonds and covalent bonds in space, ionic bonds are stronger. However, if you compare the two bonds in water, covalent bonds are stronger because water dissociates ionic bonds. For example, if you put NaCl in water, it dissolves , the Na+ ion and the Cl- ion will separate.
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