Just in case you wondered what 16 Lennard-Jones particles arranged on a grid might do ;)

In each step of the simulation the pairwise forces are calculated according to a Lennard-Jones potential, which is typically used to model the van der Waals interactions between atoms. Therefore, this simulation kind of resembles how atoms would behave. However, the model does not include any quantum effects or chemical bonds. Therefore, it would best resemble heavy nobel gas atoms, as they do not form chemical bonds, and the quantum effects are less important for heavier atoms.