Answer:
The strong attraction of each shared electron to both nuclei stabilizes the system, and the potential energy decreases as the bond distance decreases. If the atoms continue to approach each other, the positive charges in the two nuclei begin to repel each other, and the potential energy increases.
The interaction that lies between two atoms change should be considered as the stabilizes the system.
Since there is a strong attraction for every shared electron for both nuclei stabilizes the system and potential energy should be reduced due to this, the bond distance should be reduced.
In the case when the atom should continue to approach each other so here the positive charges in the two nuclei started to repel each other.
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