The symbol for the element nitrogen is N. Nitrogen is a colorless, odorless gas and comprises about 78% of the Earth’s atmosphere, making it the most abundant gas in the atmosphere. It is a crucial component of amino acids, proteins, and nucleic acids, which are essential for all forms of life. Nitrogen is also used in various industrial applications, including the production of fertilizers, explosives, and ammonia. Additionally, nitrogen exists in several allotropes, the most stable being diatomic nitrogen (N₂), which is relatively inert due to the strong triple bond between the nitrogen atoms.