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
7. metal
8. [metal by composition or origin]
9. nonferrous metal
10. [calcium and calcium compounds]

Additional parents:

1. top of the aat hierarchies
2. Materials Facet
3. Materials
4. materials
5. materials by composition
6. inorganic material
7. metal
8. metal by composition or origin
9. nonferrous metal

Anotations

Scope note:

A silvery white metal, with symbol Ca and atomic number 20, the fifth most abundant element in the earth's crust, occurring in many compounds. Its uses include as a nutritional supplement to assist the growth of bone and teeth, as a dehydrating agent for organic solvents, and to remove gases from molten metals prior to casting.