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An atom (ex: P, S) is said to have an expanded valence shell if it has more than an octet (8 valence electrons). This is only possible when the valence shell has enough orbitals to "make space" for the extra electrons.
In class I remember Phosphorus, Sulfur, and Chlorine being given as examples. Are other elements beyond these 3 capable of having an expanded octet. I have written in my notes that atoms in Period 3 or higher have d-orbitals in valence shells that accommodate additional electrons, so does that apply to other elements aside from the ones I mentioned?
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