Why does hydrogen bond is not formed between h and f?
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Yes, This compound is formed and called Hydroflouric acid.
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Hydrogen bonds only form when the hydrogen is attached to what I call a FON, in other words a fluorine, oxygen or nitrogen atom. And there must also be another FON with a lone pair lined up with that hydrogen.
Although if you look up chlorine, you may find that it's electronegativity is greater than that of nitrogen, it seems that it's the atomic radius of the FON atoms which is important here. F, O and N are all particularly small atoms (unlike chlorine). When the lone pair on a FON lines up with a slightly-positive hydrogen, the nuclei of the two atoms are both very close to the lone pair. Hence, the attraction between the lone pair and both nuclei is particularly strong
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