Fe is 2+ and SO4 is 2-
So...
Iron (II) Sulfate would be FeSO4
Formula: (CH3COO)2Fe
FeI2
Formula: Fe(ClO4)2
Formula: Fe(OH)2
Fe(ClO4)2
Formula: (NH4)2Fe(SO4)2
The formula for iron(II) hypophosphite is Fe(H2PO2)2.
The chemical formula for iron(II) dihydrogen phosphate is Fe(H2PO4)2.
Copper sulfate has CuSO4 as its formula. Copper sulfate is also written copper (II) sulfate.
Copper sulfate has CuSO4 as its formula. Copper sulfate is also written copper (II) sulfate.
There are two kinds of copper sulfate, even without considering hydrates. Cu(I) sulfate has the formula Cu2SO4 and Cu(II) sulfate has the formula CuSO4.
The formula for magnesium {note correct spelling} sulfate is MgSO4.