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The octet rule states that chemical compounds tend to form so that each atom has an octet of electrons in


d orbital


s orbital


1s orbital


Highest occupied energy level

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Highest occupied energy level.

Explanation: The octet rule refers to having eight electrons in an atom's valence (highest occupied) shell—mainly filling the s and p subshells—not specifically the d, s-only, or 1s orbitals.