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Since a valence shell beyond period three can be expanded to accommodate upwards of 12 electrons, what is the largest practical expanded valence shell that can be found in a Lewis structure?
the larger the central atom, the larger the number of electrons that can surround it and expanded valence shells occur most commonly when the central atom is bonded to small electronegative atoms like F, Cl, and O. The greatest I can think of is iodine heptafluoride which has 7 bonds, but expanded valence shells with 5 bonds or 6 bonds are more commonly seen.
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