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Submitted 10 Jan Accepted 28 Mar First published 17 Apr At this distance, the potential energy of the system is said to be equal to zero see Figure 1.
Figure 1. The graph shows how the potential energy of two hydrogen atoms changes as a function of their separation distance. As the atoms approach one another, their electron clouds gradually begin to overlap. Now there are several interactions which begin to occur. One is that the single electrons that each hydrogen atom possesses begin to repel each other. This repulsive force would tend to make the potential energy of the system increase. However, the electron of each atom begins to be attracted to the nucleus of the other atom.
This attractive force tends to make the potential energy of the system decrease. As the atoms first begin to interact, the attractive force is stronger than the repulsive force and so the potential energy of the system decreases, as seen in the diagram.
Remember that the lower potential energy increases the stability of the system. As the two hydrogen atoms move closer and closer together, the potential energy continues to decrease. Eventually, a position is reached where the potential energy is at its lowest possible point. If the hydrogen atoms move any closer together, a third interaction begins to dominate and that is the repulsive force between the two positively-charged nuclei.
This repulsive force is very strong as can be seen by the sharp rise in energy at the far left of the diagram.
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