Formula: (NH4)2Fe(SO4)2
No, it is not
FeI2
Formula: (CH3COO)2Fe
Fe(ClO4)2
Formula: Fe(ClO4)2
FeBr2 is Iron II Bromide
Formula: Fe(OH)2
1 : 1
Ferrous or iron(II) compounds can easily be oxidised to ferric or iron(III) compounds, when exposed to air. So iron(II) sulphate which is stored for some time will have iron(III) sulphate present.
Fe is 2+ and SO4 is 2- So... Iron (II) Sulfate would be FeSO4
The formula for iron(II) hypophosphite is Fe(H2PO2)2.
The chemical formula for iron(II) dihydrogen phosphate is Fe(H2PO4)2.