Nitrogen is a colorless, odourless, tasteless, non-metal gas. It is a constituent element of amino acids, and therefore of proteins as well. The main source of nitrogen is the atmosphere, where it is present as nitrogen gas (formula N2).

Fast Facts:

  • Occurs in all living organisms.
  • Constitutes 78.08% by volume of Earth's atmosphere.
  • Discovered by Daniel Rutherford in 1772.