* Electronegativity Difference: Iron (Fe) has an electronegativity of around 1.8, while sulfur (S) has an electronegativity of around 2.5. This significant difference in electronegativity (about 0.7) indicates that sulfur has a stronger attraction for electrons than iron.

* Electron Transfer: Due to the electronegativity difference, sulfur will tend to gain electrons from iron. This electron transfer will result in iron losing electrons and becoming a positively charged ion (Fe²⁺), while sulfur gains electrons and becomes a negatively charged ion (S²⁻).

* Ionic Bond Formation: The electrostatic attraction between the oppositely charged ions (Fe²⁺ and S²⁻) will lead to the formation of an ionic bond.

Therefore, the compound formed between iron and sulfur is likely to be an ionic compound like iron(II) sulfide (FeS).