Here's why:

* Organic compounds are primarily composed of carbon, hydrogen, and often oxygen, nitrogen, and other elements. They are typically found in living organisms or their byproducts.

* Inorganic compounds are all other compounds not considered organic. They can be derived from minerals, rocks, or other non-living sources.

Sulfur is an element, and elements are not considered organic. While sulfur can be found in some organic compounds, it exists as elemental sulfur (S8) in sulfur powder, making it inorganic.