The electronegativity difference between a fluorine atom and a lithium atom can be calculated by subtracting the electronegativity value of lithium from that of fluorine:Electronegativity difference = Electronegativity of Fluorine - Electronegativity of LithiumElectronegativity difference = 4.0 - 0.98Electronegativity difference = 3.02So, the electronegativity difference between a fluorine atom and a lithium atom is 3.02.