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They normally don't have electrons in the d-orbital, but because they have a n=3, the d-orbital exists and is available to them to fill up with more than 8 electrons, which allows them to have an expanded octet.
Michelle Shin 4B wrote:The elements P, S, and Cl can accommodate more than 8 valence electrons since atoms in period 3 or higher have d-orbitals that can accommodate more electrons.
Are they the only three that can do this?
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