Iron $Fe$ is a transition metal with various oxidation states. In this list of compounds, we have:

Fe - Elemental ironFe2$SO4$3 - Iron$III$ sulfateFe$OH$3 - Iron$III$ hydroxideFe2O3 - Iron$III$ oxide $rust$FeS - Iron$II$ sulfideH2S - Hydrogen sulfide gasSO2 - Sulfur dioxide gasSO3 - Sulfur trioxide gasH2SO4 - Sulfuric acidNa2SO4 - Sodium sulfateBaSO4 - Barium sulfate

These compounds contain iron and sulfur in various forms and oxidation states, along with other elements such as oxygen and sodium. Iron is a versatile element with many useful compounds and applications in chemistry and industry.