When naming an ionic compound, the name of the cation is followed by the name of the anion. Mon-atomic anions are named with the ending -ide.
Example : Fluoride
The compound FeSO₄
Fe (Iron) is a transition metal that can form more than one type of cation.
SO₄ is known as Sulfate = {One Sulfer and four Oxygen atoms}
Therefore, the name of the compound is Iron (II) Sulfate.