How does the formation of a covalent bond lower the potential energy of the two atoms in the bond?

Answer is: the lowest potential energy occurs when the two nuclei are an optimum distance apart from one another so that they don't repel each other.
Covalent bond length is the internuclear distance at which the lowest potential energy is achieved. Lower potential energy increases the stability of the system. 

Read the sentences below in 1962, i tried to enroll as the first black student at the university of mississippi. the governor of mississippi blocked my entrance which best describes the verbs used in the sentences? o they are past tense verbs, which are often used in narrative essays o they are past tense verbs, which are not often used in narrative essays. o they are future tense verbs, which are often used in narrative essays o they are future tense verbs, which are not often used in narrative essays.