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Our chemistry teacher taught us about Hannay smith equation for calculating the percent ionic character. He did not told how that equation was derived. I could not find any satisfactory result from google search either. But, I am curious to know how it was derived.

$$ \% \hspace{2mm} ionic \hspace{2mm} character=[16(\Delta E.N.)+3.5(\Delta E.N.)^2]\%$$

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    $\begingroup$ I assume it is the result of empirical interpolation of data, rather than derivation. $\endgroup$
    – Poutnik
    Jan 25, 2023 at 9:00

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