* It is shiny. Metals are generally shiny because they reflect light well.

* It is malleable. Metals can be hammered into thin sheets.

* It is ductile. Metals can be drawn into thin wires.

* It is a good conductor of heat and electricity. Metals allow heat and electricity to flow through them easily.

* It is reactive. Metals react with other elements to form compounds.

Sulfur is a nonmetal because it does not have any of the properties of metals. It is not shiny, it is not malleable, it is not ductile, it is not a good conductor of heat and electricity, and it is not very reactive.

In addition, iron is a solid at room temperature, while sulfur is a gas. This is also a characteristic of metals and nonmetals, respectively.