Chapter 8.8, Problem 3CP

In which species does the central atom obey the octet rule? (Select all that apply.)

$\begin{array}{l}\begin{array}{l}\text{a)}\hfill \\ {\text{I}}_3^{\text{-}}\hfill \\ \text{b)}\hfill \\ {\text{BH}}_3\hfill \\ \text{c)}\hfill \\ {\text{AsF}}_{\text{6}}^{\text{-}}\hfill \\ \text{d)}\hfill \\ {\text{NO}}_{\text{2}}\hfill \\ \text{e)}\hfill \end{array}\\ {\text{CIO}}_{\text{4}}^{\text{-}}\end{array}$