Why do atoms form covalent bonds?

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Multiple Choice

Why do atoms form covalent bonds?

Atoms form covalent bonds because they want a full outer electron shell, which is more stable and lower in energy. They accomplish this by sharing electrons, so each atom can count those shared electrons toward filling its valence shell. For most elements this means achieving eight valence electrons (the octet rule), while hydrogen needs only two. This shared-electron approach explains why nonmetals bond with each other rather than transferring electrons. The idea that outer shells become full captures this stability-driven drive. Other possibilities—outer shells emptying, inner shells filling, or gaining full charge—don’t describe covalent bonding and, in fact, transferring electrons tends to lead to ionic bonds rather than covalent sharing.

Atoms form covalent bonds because they want a full outer electron shell, which is more stable and lower in energy. They accomplish this by sharing electrons, so each atom can count those shared electrons toward filling its valence shell. For most elements this means achieving eight valence electrons (the octet rule), while hydrogen needs only two. This shared-electron approach explains why nonmetals bond with each other rather than transferring electrons. The idea that outer shells become full captures this stability-driven drive. Other possibilities—outer shells emptying, inner shells filling, or gaining full charge—don’t describe covalent bonding and, in fact, transferring electrons tends to lead to ionic bonds rather than covalent sharing.

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