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LiF - dispersion force and ionic bonding

BeF_2 - dispersion force and ionic bonding

BF_3 - dispersion force

CF_4 - dispersion force

NF_3 - dispersion force and diople-diople interaction

OF_2 - dispersion force and diople-diople interaction

F_2 - dispersion force

They all have at least dispersion force

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Q: Fluorides of the second-period elements and their melting points are lif 845c bef2 800c bf3 -126.7c cf4 -184c nf3 -206.6c of2 -223.8c f2 -219.6c Classify the types of molecular forces present in each?
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