Which of the following pairs of elements has the greatest difference in electronegativity?

Which of the following pairs of elements has the greatest difference in electronegativity?
A. Na and F
B. Na and CI
C. Na and Br
D. Na and I

Correct Option: Answer is A
sodium has an electro negativity of 0.93
Hence; sodium and fluorine have the highest difference.
Fluorine 4.0
Chlorine 3.0
Bromine 2.8
Iodine 2.5

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