The letter 'N' represents the element nitrogen on the periodic table. It has the atomic number 7 and is classified as a non-metal. Nitrogen makes up approximately 78% of Earth's atmosphere and is essential for life, as it is a key component of amino acids and nucleic acids. It exists in various forms, including diatomic nitrogen gas (N2) and is found in a wide range of compounds like fertilizers. Nitrogen undergoes processes like nitrogen fixation, crucial for supporting plant growth, highlighting its importance in both the environment and biological systems.