AIIMS 2019 Chemistry Electronegativity MCQ Question

The maximum electronegativity difference occurs between sodium (Na) and fluorine (F), as fluorine has the highest electronegativity value (approximately 4.0 on the Pauling scale) while sodium has a much lower value (approximately 0.9), resulting in a difference of about 3.1. In contrast, the other pairs, such as lithium (Li) & fluorine (F) and sodium (Na) & bromine (Br), have smaller differences due to the relatively closer electronegativity values of the elements involved. For example, the electronegativity difference between Li (1.0) and F (4.0) is 3.0, and between Na (0.9) and Br (2.8) is 1.9, both of which are less than that of Na & F.