What is true about a sulfade ion?

A sulfide ion (S²⁻) is a negatively charged ion formed when sulfur gains two electrons. It is commonly found in various compounds, such as metal sulfides, and plays a role in biological processes, particularly in certain metabolic pathways. Sulfide ions are known for their characteristic odors, often associated with rotten eggs, and can be toxic in high concentrations. Additionally, they are important in environmental chemistry, particularly in the cycling of sulfur in ecosystems.