ChemGlobe: Nitrogen
- Electronic, thermal, and steric data along with basic facts and an isotope table.
- http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/7.html

LANL: Nitrogen
- History, sources, natural compounds, and ammonia.
- http://periodic.lanl.gov/elements/7.html

Wikipedia: Nitrogen
- Properties of the element, including its history, applications, and characteristics.
- http://en.wikipedia.org/wiki/Nitrogen

Lenntech: Nitrogen
- Physical data, chemical properties, health and environmental effects.
- http://www.lenntech.com/Periodic-chart-elements/N-en.htm

EnvironmentalChemistry.com: Nitrogen
- Atomic structure, chemical and physical properties, and table of nuclides.
- http://environmentalchemistry.com/yogi/periodic/N.html

USGS Minerals Information: Nitrogen
- Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
- http://minerals.usgs.gov/minerals/pubs/commodity/nitrogen/

Especiál Gas Inc.: Nitrogen
- Numeric data, uses, and general information.
- http://www.c-f-c.com/specgas_products/nitrogen.htm

ChemicalElements.com: Nitrogen
- Basic information, atomic structure, and table of isotopes.
- http://www.chemicalelements.com/elements/n.html

It's Elemental: Nitrogen
- Basic physical and historical information.
- http://education.jlab.org/itselemental/ele007.html

Visual Elements: Nitrogen
- Animation, uses, physical information, and key isotopes.
- http://www.chemsoc.org/viselements/pages/nitrogen.html