The bonding of two atoms will most likely occur if:

a more stable state can result from the union

the outer shell can be completely filled

all the balance electrons are removed

the electronegativities of both atoms are similar

A more stable state can result from the union.

Explanation:

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At first, we must consider that chemical bonds are formed as result of chemical processes that causes atoms and molecules to be attracted to each other and held together via linkages turning out in more stable chemical compounds. In addition, atoms are more reactive, and subsequently more likely to form the aforesaid linkage, when their outer electron orbitals are not complete. Atoms become less reactive when the outer orbitals get full, that is why noble gases do not react.

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The answer is the electronegativities of both atoms are similar because none of the other answers make sense.