AP BIOLOGY

Detailed explanation-1: -Nitrogen gas makes up around 78 percent of the atmosphere, making it the most prevalent uncombined element on the planet. Nitrogen gas has the chemical formula N2 which can be denoted by N≡N.

Detailed explanation-2: -In the atmosphere, nitrogen exists as a gas (N2), but in the soils it exists as nitrogen oxide, NO, and nitrogen dioxide, NO2, and when used as a fertilizer, can be found in other forms, such as ammonia, NH3, which can be processed even further into a different fertilizer, ammonium nitrate, or NH4NO3.