What elements had a filled outermost shell Li Ne Mg CI He Si?

Among the elements listed, Neon (Ne) and Helium (He) have filled outermost shells. Neon has eight electrons in its outer shell, while Helium has two, both fulfilling the octet rule for stable electronic configurations. The other elements—Lithium (Li), Magnesium (Mg), Chlorine (Cl), and Silicon (Si)—do not have filled outermost shells.