Electronegativity differences between bonded atoms result in an uneven sharing of electrons between them. which of the following represents a bonded pair of atoms with the highest degree of uneven sharing?
c-h
ba-f
p-cl
o-o

Ba-F bond has the highest degree of uneven sharing because the difference between the electonegativity of F (which is 4.0) and Ba (0.89), is the largest of all other bonds

The best and most correct answer among the choices provided by your question is the second choice.

Ba-F represents a bonded pair of atoms with the highest degree of uneven sharing among the given choices.

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They can measure  the amount of energy gained or lost