Nitrogen： Gaseous chemical element, chemical symbol N, atomic number 7. A colourless, odourless, tasteless gas, it makes up 78% of Earth's atmosphere and is a constituent of all living matter.
Nitrogen： Gaseous chemical element, chemical symbol N, atomic number 7. A colourless, odourless, tasteless gas, it makes up 78% of Earth's atmosphere and is a constituent of all living matter.
氮:气态化学元素，化学符号N，原子序数7。无色、无臭、无味的气体，占地球大气的78%，也是所有生物体的组成部分。