For the bond formation rule to be met, the octet rule, which calls for 8 electrons in the outermost shell, must be present.
What is octet rule?
According to the "octet rule," an atom is the most stable when it has a complete valence (outer) shell (typically 8 electrons, but hydrogen and helium only have two). As a result, the atoms involved in covalent (nonmetal to nonmetal) bonding often have eight valence electrons following the bond.
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