# Can you name the following ionic compound Fel2?

Apr 23, 2014

$F e {I}_{2}$ is an ionic compound called Ferrous Iodide
or Iron (II) Iodide.

Iron is a transition metal and has oxidation states of $F {e}^{+ 2}$ or $F {e}^{+ 3}$. Since the iodide ion only has a charge of ${I}^{-} 1$ and there are two iodide ions in the molecule, this informs us that the iron is in the $F {e}^{+ 2}$ oxidation state.

There are two types of naming, the Systemic or Stock name using a roman numeral to identify the oxidation state therefore, we use
Iron (II) for the $F {e}^{+ 2}$ oxidation state. Or we can use the common name identifying the $F {e}^{+ 2}$ oxidation state as ferrous. The lower oxidation state ends in the suffix -ous and the higher oxidation state will end in the suffix -ic, $F {e}^{+ 2}$ is ferrous and $F {e}^{+ 3}$ is ferric.

$F e {I}_{2}$ is called Ferrous Iodide or Iron (II) Iodide.
$F e {I}_{3}$ is called Ferric Iodide or Iron (III) Iodide

Other examples of transition metals would include $C {u}^{+ 1}$ is cuprous, Copper (I) and $C {u}^{+ 3}$ is cupric, Copper (II) or $S {n}^{+ 2}$ is stannous, Tin (II) and $S {n}^{+ 4}$ is stannic, Tin (IV).