7
Nitrogen
Atomic Number7
Atomic Mass14.007 u
CategoryNonmetal
State at Room TempGas
Year Discovered1772
About Nitrogen
Makes up 78% of Earths atmosphere. Essential for amino acids, DNA, and proteins. Liquid nitrogen boils at -196C and is used in cryogenics. The Haber process fixes nitrogen into ammonia for fertilizers, feeding half the worlds population. Nitrogen in tires maintains pressure better than air. Inert nitrogen atmosphere prevents oxidation in food packaging.
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