Which is more ionic?

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Which is more ionic?

Postby kshalbi » Fri Oct 30, 2015 9:23 pm

There's a question that says: Which is more ionic? LiH or HCl. I thought it was HCl because according to the trends in the periodic table, H and Cl should have a larger difference in electronegativity than Li and H making it more ionic, but apparently this isn't right because the answer is LiH. Can someone please explain this to me? Muchas gracias.

Shreya Banerjee 2F
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Joined: Fri Sep 25, 2015 3:00 am

Re: Which is more ionic?

Postby Shreya Banerjee 2F » Fri Oct 30, 2015 9:35 pm

LiH is more ionic because the ions in it have lower polarizability. The larger Cl- molecule has a higher polarizability, making the compound HCl more covalent in character and thus less ionic.

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