Fluorine has a small XDM dispersion coefficient ( C 6,F = 8.2 a.u.), consistent with its low atomic polarizability. The standard deviation of these values is small (σ = 0.1 a.u.), suggesting that a single set of Lennard-Jones parameters are appropriate for fluorine atoms in organofluorines. The fluorine CGenFF and OPLS force-field dispersion coefficients are in reasonable agreement with the XDM values, although the dispersion coefficients for GAFF are roughly double the XDM value.