Is it possible for the dispersion forces in a particular substance to be stronger than the hydrogen bonding forces in another substance?
I get that in general, LD is weaker than H-bonding, but LD does exist is both polar and nonpolar substances and what if it occurred between Fr and Fr (the biggest atom), would it be stronger than hydrogen bonding?
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I think your understand is correct. It is unlikely that a Fr-Fr bond would be formed but if it were it would be a covalent bond as H-H is. And Fr does have dispersion forces as all atoms have.
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