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. [nitrogen and nitrogen isotopes, compounds]

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 with atomic number 7 and symbol: N. It is an odorless, gaseous element that makes up 78% of the earth's atmosphere, is a constituent of all living tissue, and is nearly inert in its gaseous form.