Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by composition]
6. inorganic material

Additional parents:

1. top of the aat hierarchies
2. Materials Facet
3. Materials
4. materials
5. materials by form
6. materials by chemical form
7. elements

Anotations

Scope note:

An element, symbol Cl and atomic number 17, that is at ordinary temperatures a greenish-yellow gas, toxic and corrosive to the eyes and respiratory system. It becomes a liquid at -29 degrees Fahrenheit. It occurs in nature in great abundance in compounds, such as common salt. Free chlorine is used as a sterilizing agent, such as for water.