The electronegativity difference between a nitrogen atom EN = 3.04 and an oxygen atom EN = 3.44 can be calculated by subtracting the electronegativity of nitrogen from that of oxygen:Electronegativity difference = EN Oxygen - EN Nitrogen Electronegativity difference = 3.44 - 3.04Electronegativity difference = 0.40So, the electronegativity difference between nitrogen and oxygen is 0.40.