(Polar molecules, Non-polar molecules, etc.)
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Yes, an expanded octet just means that an atom can have more than 8 valence electrons, it does not limit the number of electrons, for example: PCl6 would be allowed with a phosphorous atom with an expanded octet to fit 12 electrons.
For atoms like P, S, and Cl, it is possible for them to have a different number of electrons that are more than 8. The reason for this is because their d-orbitals are able to accept additional electrons. Since there are multiple d-orbitals available, the # of valence electrons does not have to be constant for each atom.
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