Nitrogen

An element represented in the periodic table by the symbol N, of atomic number 7 and atomic mass 14.00674. Has the electron configuration 1s²2s²2p³.
It is a major component of proteins.

DNA bases (G,C,A,T) have a nitrogen-carbon ring structure, which are known as nitrogenous bases^[1].

References

1. ↑ Hames, D et al. (2005) Biochemistry, 3rd ed.UK Taylor and Francis p173