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We haven't explicitly learned this yet, but octet expansion can only result when electrons have additional orbitals to fill at a given principal energy level. The most common form of octet expansion occurs when atoms have their valence electron in the 3rd principal level or higher and are able to form bonds by filling d-sublevel orbitals with electrons
I don't think that the atoms with an expanded octet necessarily have to have 10 electrons. However, you should always make sure that your lewis structure with the atom with an expanded octet has the same amount of electrons as the amount you calculated prior.
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