Numerous works on calculus, MD simulations, and Mont Carlo simulations have been published based on the Lennard-Jones potential model. Equilibrium distance is a critical factor in those works. Many theories, such as the van der Waals cohesive and dispersion forces, must be proposed to calculate the equilibrium distance. However, the above equation discloses a simple world with the rational results. For example, at 298 K, Le for N2, O2, and CH4 are 3.11, 3.11, and 3.68 Å, comparable to the data adopted in MD simulations of the literature. Moreover, the equation includes the temperature factor. An electron is characterized as a particle with a large α dependent on the interaction distance. Two electrons are attractive at a distance depending on the temperature. For example, at 4, 298, and 2000 K, the attractive force is more potent than the repulsive force at a distance >1 μm, 10, and 2 nm. Since the rotational attribute of attractive force, the attraction is possibly regarded as the repulsion by miss because an electron looks to avoid another one. The electronic temperature determines the interaction distance of electrons. Regarding the electron-proton interaction as attractive, the electron temperature, the velocity, and the kinetic energy of the electron on the atom surface are calculated. It is found that all these parameters exhibit periodicity as the serial number of elements increases. The electron temperature is 10 3 -10 4 km/s. The first ionization energies of elements reported in the references are close to the kinetic energies calculated in this paper.