1. The problem statement, all variables and given/known data Just my question from looking at a table of lennard-jones parameters (molecular species and accorded ε), it seems the depth of a Lennard-jones potential is strongly related to a covalent bond? Not hw-related, but course-related anyhow, so any suggestions would be welcome. 2. Relevant equations ..well, I am just going to include an equation from the same section I found the table in: u(r) = ε(r*/r)12 - 2ε(r*/r)6 3. The attempt at a solution I understand that Lennard-jones potential is contributed by dipole-dipole, induced dipole and London-dispersion attraction.....and seeing how ε/kB increases dramatically from Hydrogen gas (37.0K) to CO (100K) to Carbon Dioxide (189K), I wonder dipole-dipole is the most significant in the potential? Also, the fact that including very polar atoms (for example Fluorine) plays an important role, for CF4 increases ε/kB to 152K? But, I don't understand why organic molecules, such as Methane, C2H4 and C3H8 have much higher ε/kB values?