Should an oxygen atom (O) gain two electrons, it would then have the same ground state electronic configuration as an atom of neon (Ne), thus satisfying the octet rule.

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Neon has an electronic configuration of 1s² 2s² 2p⁶, meaning it has a full valence shell with 8 electrons. Oxygen has an electronic configuration of 1s² 2s² 2p⁴, meaning it is two electrons short of having a full valence shell. If it gains two electrons, it will have the same electronic configuration as neon, satisfying the octet rule.

Should an Oxygen Atom (O) Gain Two Electrons, It Would