* Valency: Sulfide has a valency of -2. This means it has a charge of -2.

* Formula: The chemical formula for sulfide is S²⁻.

Explanation:

* Sulfur (S) is a non-metal in group 16 of the periodic table. It tends to gain two electrons to achieve a stable electron configuration like the noble gas Argon.

* This gain of two electrons gives it a -2 charge, hence the valency of -2.

* Sulfide (S²⁻) is the anion formed when sulfur gains two electrons.

Examples of Compounds with Sulfide:

* Hydrogen sulfide (H₂S): A colorless gas with a rotten egg smell.

* Iron sulfide (FeS): A black solid found in minerals.

* Sodium sulfide (Na₂S): A white solid used in various industrial processes.