Attempt Quiz on Nitrogen

Nitrogen is a colorless, odorless, and tasteless gas that makes up about 78% of Earth’s atmosphere. It has the atomic number 7 and the chemical symbol N. Nitrogen is essential for all living organisms because it is a key component of amino acids, proteins, and DNA. Although nitrogen gas (N₂) is very stable and not easily reactive, certain bacteria and lightning convert it into compounds that plants can use — a process called nitrogen fixation. Nitrogen is also used in fertilizers, explosives, refrigeration, and as a preservative for food and chemicals.