# Wha tis the name of CdI_2?

$C {\mathrm{dI}}_{2}$ is an ionic compound made of three ions: $C {d}^{2 +}$ and two ${I}^{-}$ ions. The positive cation is named as its element: cadmium. Since Cd has a +2 charge and is a transition metal, (II) is added after the cation name. Since this is an ionic compound, it is not necessary to identify the number of iodine ions in the name, so the anion is named iodide. Putting all pieces together, the name is: Cadmium (II) iodide