Chapter 9, Problem 11QP

Predict the geometry of the following ions using the VSEPR method: (a) ${\text{SCN}}^{\text{-}}$ (arrangement of atoms is SCN), (b) ${\text{AlH}}_4^{-}$, (c) ${\text{SnCl}}_5^{-}$, (d) ${\text{H}}_{\text{3}}{\text{O}}^{\text{+}}$, (e) ${\text{BeF}}_4^{2-}$.