The electronegativity difference between a potassium atom and a chlorine atom can be calculated by subtracting the electronegativity value of potassium from that of chlorine:Electronegativity difference = Electronegativity of chlorine - Electronegativity of potassiumElectronegativity difference = 3.16 - 0.82Electronegativity difference = 2.34So, the electronegativity difference between a potassium atom and a chlorine atom is 2.34.