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Hey, everyone! So I know elements from 3p and below on the periodic table are able to form an expanded octet (that is, they can have more than 8 overall electrons). However, do they ALWAYS form expanded octets (e.g. will Cl aways have more than 8 electrons in a Lewis structure)? Thanks in advance :)
I don't think that they will always have more than 8 electrons because it depends on the total count of the valence electrons in the molecule. For example, when sodium and chlorine form NaCl, Cl does not have more than 8 electrons in its valence shell. The expanded octet rule does not mean that they will always have an expanded octet, rather, it states that the elements in 3p and below are capable of accepting more electrons because they can hold electrons in their unfilled d orbitals.
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