The electronegativity of an element is a measure of its ability to attract electrons in a chemical bond. In the case of NO2 nitrogen dioxide , we can find the electronegativity difference between oxygen and nitrogen atoms by referring to the Pauling electronegativity scale.According to the Pauling scale, the electronegativity of nitrogen N is 3.04, and the electronegativity of oxygen O is 3.44. To find the electronegativity difference between these two elements, we can simply subtract the electronegativity of nitrogen from that of oxygen:Electronegativity difference = Electronegativity of oxygen - Electronegativity of nitrogenElectronegativity difference = 3.44 - 3.04Electronegativity difference = 0.40So, the electronegativity difference between oxygen and nitrogen atoms in a molecule of NO2 is 0.40.