The chemical element represented by the symbol "N" is nitrogen. Nitrogen is a non-metal that belongs to Group 15 of the periodic table and is essential for all living organisms as it forms a key component of amino acids, nucleic acids, and proteins. It makes up about 78% of Earth's atmosphere in the form of diatomic nitrogen gas (N₂). Nitrogen is also a vital element in fertilizers, promoting plant growth and agricultural productivity. Its role in the nitrogen cycle involves processes like fixation, nitrification, and denitrification, which are crucial for ecosystem functioning.