Q. Which pair of atoms has the highest electronegativity difference?
(Calcium's electronegativity is 1.0
Fluorine's electronegativity is 4.0
Hydrogen's electronegativity is 2.2
Sodium's electronegativity is 0.93)

• (A) F-F
• (B) Ca-F
• (C) H-F
• (D) Na-F