Why do representative elements tend to form bonds giving them a total of 8 valence electrons?

Representative elements tend to form bonds that result in a total of 8 valence electrons due to the octet rule, which states that atoms are more stable when they have a full outer shell of electrons. By gaining, losing, or sharing electrons through chemical bonding, these elements achieve a stable electron configuration similar to that of noble gases. This drive for stability leads to the formation of covalent, ionic, or metallic bonds, allowing them to reach an octet in their valence shell.