There seems to be a misunderstanding in the question. Sodium chloride NaCl is a compound composed of sodium Na and chlorine Cl atoms, not oxygen O . Therefore, it is not possible to determine the electronegativity difference between chlorine and oxygen in NaCl.However, I can provide you with the electronegativity values of chlorine and oxygen. Chlorine Cl has an electronegativity value of 3.16, while oxygen O has an electronegativity value of 3.44. The difference between their electronegativities is 3.44 - 3.16 = 0.28.