# Iodine is an element in Group 7A of the periodic table. Which type of ion does iodine form?

..........Iodine thus tends to attract electron density, and the addition of a single electron will provide a full valence shell. Thus it is reduced and forms an $\text{iodide ion}$, ${I}^{-}$. All the halogens form this ion upon reduction:
$\frac{1}{2} {X}_{2} + {e}^{-} \rightarrow {X}^{-}$