Nitrogen and Oxygen are both elements that can be found on the periodic table. Nitrogen is represented by the symbol N and has an atomic number of 7, while Oxygen is represented by the symbol O and has an atomic number of 8. Both elements are gases at room temperature and pressure. Nitrogen is the most abundant ELEMENT in the Earth's atmosphere, making up 78% of the air we breathe. Oxygen is the second most abundant ELEMENT in the atmosphere, making up 21%. Both elements are essential for life on Earth, as they are used in many biochemical processes.