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Why LiF is not polar covalent?

Updated: 4/28/2022
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10y ago

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The electronegativity difference of 3.0 indicates an ionic bond rather than a polar covalent.

However LiF is not very soluble, like other Li salts. This is due to a partial covalent character in the bond due to the high polarising power of the small Li+ ion which distorts the electron cloud round the anion. The extent of this effect caused by cations is predicted in "Fajan's Rules"

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Q: Why LiF is not polar covalent?
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The electronegativity difference of 3.0 indicates an ionic bond rather than a polar covalent. However LiF is not very soluble, like other Li salts. This is due to a partial covalent character in the bond due to the high polarising power of the small Li+ ion which distorts the electron cloud round the anion. The extent of this effect caused by cations is predicted in "Fajan's Rules"


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