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nitrogen
Nitrogen
N, atomic number 7. Third most abundant element by body mass (~3%). Present in every amino acid (α-amino group, peptide bond), every nucleotide base, and in haem. Atmospheric N₂ is inaccessible; biological nitrogen derives entirely from dietary protein.
Entry Metadata
| Field | Value |
|---|---|
| ID | nitrogen |
| Name | Nitrogen |
| Status | draft |
| Last reviewed | 2026-06-05 |
| Atlas | 01-human |
| Scale | 02-atomic |