So the intermolecular bonds of alkanes are Vanderbilt forces. And these are simply instantaneous dipoles created between the protons found in the nuclei and the electrons surrounding or orbiting those nuclei. So these valuable forces exist only for a moment, and that's exactly why they are relatively weak forces compared to bonds like polar bonds. Now, so let's talk about this blue region here. So this blue region on pentane and neopentane represents the boundarbal forces, the instantaneous dipoles created by these two molecules. Notice that this is relatively symmetrical.