Nitrogen is an interesting element because it is in all living organisms, and it is the largest single constituent of the Earth's atmosphere (78.082% by volume of dry air, 75.3% by weight in dry air). It is created by fusion processes in stars, and is estimated to be the 7th most abundant chemical element by mass in the universe. The following links give you plenty of information and specific answers about this fantastic element.

Nitrogens symbol is N, atomic number of 7 and atomic mass 14.00674 u. Nitrogen is a colorless, odorless, tasteless and mostly inert gas made of two atoms at standard conditions. It constitutes 78.08% by volume of Earth's atmosphere. The element nitrogen was discovered as a separable component of air, by Scottish physician Daniel Rutherford, in 1772.Many industrially important compounds, such as ammonia, nitric acid, organic nitrates (propellants and explosives), and cyanides, contain nitrogen. Nitrogen as an element has extremely strong bonds, causing difficulty for both organisms and industry in breaking the bond to convert the N₂ into useful compounds, but at the same time causing release of large amounts of often useful energy when the compounds burn, explode, or decay back into nitrogen gas.

The nitrogen cycle describes movement of the element from air into the biosphere and organic compounds, then back into the atmosphere. Synthetically-produced nitrates are key ingredients of industrial fertilizers, and also key pollutants in causing the eutrophication or overfertilization of lakes or water systems. Nitrogen is a constituent element of amino acids and thus of proteins, and of nucleic acids (DNA and RNA). It resides in the chemical structure of almost all neurotransmitters, and is a defining component of alkaloids, biological molecules produced by many organisms.