ReaxFF parameters are grouped by the number of atoms involved in the interaction (e.g., single-body, two-body, three-body and four-body) in addition to the system-wide global parameters. Based on the distances and angles between atoms and corresponding model parameters, bonded, 3-body, 4-body, H-bond and non-bonded interaction lists are formed dynamically at each timestep. For every interaction, corresponding parameters from the parameter set based on the element types of the atoms involved are used to calculate the E system . As described in detail in , there exist parameter sets for different kinds of simulations such as combustion, aqueous systems, metals and biological systems.