Why does LiF have higher percentage of ionic character than KF?  [ENDORSED]

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Yinhan_Liu_1D
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Why does LiF have higher percentage of ionic character than KF?

Postby Yinhan_Liu_1D » Tue Oct 25, 2016 7:07 pm

According to the text, the greater the difference in electronegativity, the greater the ionic character of the covalent bond.

Li has Higher Electronegativity than K.
Why does LiF have higher percentage of ionic character than KF (in the percentage graph on page 92)?

I would appreciate your help;)

Chem_Mod
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Re: Why does LiF have higher percentage of ionic character than KF?  [ENDORSED]

Postby Chem_Mod » Tue Oct 25, 2016 11:27 pm

The answer lies in the fact that percent ionic character can be interpreted in different ways. In this course, we will use electronegativity differences as you have done. The graph on page 92 takes the internuclear bond distance into account, and thus defines the percent ionic character as function of the resulting dipole moment. Like nearly all the periodic trends, this can lead to rare exceptions.


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