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Explanation Nitrogen is the chemical element with the symbol N and atomic number 7. Nitrogen is a nonmetal and the lightest member of group 15 of the periodic table, often called the pnictogens. It is a common element in the universe, estimated at seventh in total abundance in the Milky Way and the Solar System. At standard temperature and pressure, two atoms of the element bind to form N₂, a colorless and odorless diatomic gas. N₂ forms about 78% of Earth's atmosphere, making it the most abundant uncombined element. Nitrogen occurs in all organisms