Answer to Question #54369 in General Chemistry for Amit
E = Ec + Ei , where Ec – the energy conditioned by the covalency of the bond and Ei – the energy conditioned by the electrostatic attraction between atoms.
The covalent radii are obtained by calculating the distance between equal atoms (H-H or F-F) when Ei = 0. Therefore, if Ei is not counted, the experimental distance differs from the calculated one.
It becomes shorter because the bound atoms with different electronegativities have the opposite charges (Hδ+ and Fδ-). Thus, they are attracted to each other increasing the energy of the bond, which means the bond becomes shorter.
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