The correct formula for the Iron II ion is Fe²⁺.
Iron can exist in multiple oxidation states, the most common being +2 and +3. The Iron II ion, specifically, indicates that iron has a +2 charge. This is significant in various chemical reactions and compounds, where iron can bond with other elements.
Understanding the charge is essential for correctly combining ions in chemical formulas. For instance, when Iron II ions bond with oxygen, they form iron(II) oxide, or FeO, which reflects the +2 charge of the iron ion.