The chemical element with the symbol 'N' is nitrogen. Nitrogen is a colorless, odorless gas that makes up about 78% of Earth's atmosphere, making it the most abundant gas in the air we breathe. It is essential for all living organisms, as it is a key component of amino acids, proteins, and nucleic acids, which are necessary for life. Nitrogen exists predominantly in a diatomic form (N2) and is relatively inert, making it stable and non-reactive under normal conditions. It plays vital roles in various biological processes and is an essential nutrient in agriculture, often used in fertilizers to enhance plant growth.