Provide an example of a selenide and a sulfide.

A selenide is a compound containing selenium, while a sulfide is a compound containing sulfur.

Selenium and sulfur are both nonmetals in the same group of the periodic table, and they have similar chemical properties. Both elements can form compounds with metals, and these compounds are often used in industrial processes or as semiconductors.

One example of a selenide is cadmium selenide (CdSe), which is a semiconductor material used in solar cells and other electronic devices. Another example is hydrogen selenide (H2Se), which is a toxic gas that can be produced by the reaction of selenium with acids.

Sulfides are also common in nature and industry. Iron sulfide (FeS) is a mineral commonly found in rocks and soils, and it is used as a source of sulfur in the production of sulfuric acid. Zinc sulfide (ZnS) is a white powder that is used as a pigment in paints and plastics, as well as in the production of semiconductors.

Both selenides and sulfides can have important biological roles as well. For example, the amino acid cysteine contains a sulfhydryl group (-SH) that can form disulfide bonds with other cysteine residues, helping to stabilize protein structures. Selenium is also an essential nutrient, and it is required for the activity of certain enzymes in the body.