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I was doing a practice problem and it was asking which compound is more ionic, LiH or HCl, and I thought the correct answer would be HCl since H and Cl have a greater electronegative distance on the periodic table from each other than Li and H, however, according to the answer key, the correct answer was LiH. Can someone please explain why this is the correct answer and not HCl?
If you look at the actual EN differences between the two compounds LiH and HCl, then you would be able to see Li and H have an actual greater difference than between H and Cl. Also, Li and H would form an actual ionic bond, since Li is a metal and H is a nonmetal, whereas H and Cl are both nonmetals so they would form a covalent bond. Based on that, you could predict the bond between Li and H would be more ionic than the bond between H and Cl.
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